Active questions tagged firefox - Super User most recent 30 from 2018-09-21T15:28:55Z 0 Firefox DNS resolution order Tobia 2018-09-21T09:28:06Z 2018-09-21T09:45:42Z <p>Do you know what is the DNS resolution process order of domain names in Firefox?</p> <p>Has the hosts file proprity over DNS server? Has the hosts file proprity over mDNS names in the network or mDNS is completely ignored?</p> <p>Thanks.</p> 5 Websites not loading correctly since Windows 8.1 upgrade David Gard 2014-02-19T11:16:28Z 2018-09-21T09:01:56Z <p>I finally upgraded my work PC to Window's 8.1 Pro on Monday (from 8 Pro), but since then I have been having problems with websites not loading correctly. This issue is occurring in both Firefox 27.0.1 and IE11.</p> <p>The website I'm trying to view does usually partially load but will not completely load. The spinner in the tab shows there is activity and clicking links does not work. In Firefox I see at the bottom the page <code>Transferring data for</code> (IE doesn't show this though).</p> <p>I use Firebug so have investigated the issue in Firefox with that, and it seems one of two things is happening -</p> <ol> <li>Not all scripts/styles are loading and never do.</li> <li>All of scripts/styles/image/etc are loading but the HTML Response for the page I'm trying to view is truncated, with only a portion of the page making it to the browser.</li> </ol> <p>I initially tried the obvious things -</p> <ul> <li>Firefox -> History -> Clear Recent History... <ul> <li>Browsing and Download History</li> <li>Form &amp; Search History</li> <li>Cookies</li> <li>Cache</li> <li>Active Logins</li> </ul></li> <li>Internet Explorer -> Tools -> Internet options -> (General) -> Delete... <ul> <li>Temporary Internet files and website files</li> <li>Cookies and website data</li> <li>History</li> </ul></li> <li>Disable all anti-virus</li> </ul> <p>This didn't work so I tried reinstalling Firefox (and uninstalling IE11 entirely), but that also didn't work.</p> <p>This is in a corporate environment where PFSense is used to manage the leased line connection that is being used, so there is no router in play that could be causing a problem. Besides, every other PC is connecting to these websites just fine (this is the only Windows 8/8.1 machine in the business).</p> <p>I'm also fairly certain that it cannot be the network card as I have been successfully connected to several Terminal Servers since the upgrade without issue.</p> <p>I'm now at a for what could be causing this, so I'd be grateful for any suggestions. Thanks.</p> 0 Dark theme on Mozilla Firefox won't go away MrCholo 2018-09-21T00:25:30Z 2018-09-21T05:15:54Z <p>I have Chrome and Firefox on my desktop/laptop and in order to quickly distinguish between which one I am using, I experimented with using a dark theme in Firefox and Chrome. I ended up turning both off, but now on a few web pages when browsing with Firefox the background becomes black and I can't read anything:</p> <p><a href="" rel="nofollow noreferrer"><img src="" alt="Firefox dark theme"></a></p> <p>I can't figure out what is causing it, I swear I have turned off all the theme and plugins etc related to the color, anyone know what it might be?</p> 0 How to set default web page size in Firefox? Tofi 2017-11-22T20:30:38Z 2018-09-20T20:50:06Z <p>I recently downloaded Firefox the new version, and for most of the part it is good. Though a problem in it I found is that every time I open a new web page I need to set the zoom level to 170% so that the page becomes readable and fits the screen size. How can I set it once and for all?</p> <p>Note: I am using a Windows 10 machine.</p> 0 Firefox custom external helper application command for Media Player Classic (MPC) user3054 2018-09-20T16:20:56Z 2018-09-20T16:20:56Z <p>I want .m3u, .mp4, mp3 or any other media file links from Firefox to be added to Media Player Classic playlist (not played immediately).</p> <p>The command line for adding to playlist looks like this: <code>mpc-hc64.exe /add {filename}</code></p> <p>In order to change functionality of how Firfox handles the MPC command I edited the <code>handlers.json</code> file:</p> <p>original:</p> <p><code>"extensions":["m3u"]},"video/x-mpegurl":{"action":2,"handlers":[{"name":"mpc-hc64.exe","path":"C:\\Program Files (x86)\\K-Lite Codec Pack\\MPC-HC64\\mpc-hc64.exe"}</code></p> <p>to:</p> <p><code>"extensions":["m3u"]},"video/x-mpegurl":{"action":2,"handlers":[{"name":"mpc-hc64.exe","path":"C:\\Program Files (x86)\\K-Lite Codec Pack\\MPC-HC64\\mpc-hc64.exe /add"}</code></p> <p>This modification doesn't work. If you have any idea on how to make this work, help would be much apperciated.</p> <p>Thanx.</p> 2 Why does Wunderlist not load in private Firefox? SQB 2017-01-31T08:35:43Z 2018-09-20T15:19:44Z <p>If I login to <em>Wunderlist</em> from a private tab in Firefox, it keeps reloading <code></code> over and over. In Chrome, I have no such problem; I can access it from private tab.</p> <p>Now the first step of the answer to the popular question <a href="" rel="nofollow noreferrer">"why won't Wunderlist load in Firefox?"</a> in Wunderlist's FAQ seems to impy it is by design.</p> <blockquote> <p><strong>1. Ensure that you are not using Wunderlist in Private Browsing mode</strong></p> </blockquote> <p>My question is two-fold:</p> <ol> <li><p><strong><em>Why</em> was Wunderlist designed to not work in private browsing mode in Firefox?</strong></p></li> <li><p><strong>Is there a known workaround for this, by tweaking the settings for instance?</strong><br> (Other than using a different browser).</p></li> </ol> 0 "Firefox is already running, but is not responding." even though MOZ_NO_REMOTE=0 iago-lito 2018-09-19T18:36:20Z 2018-09-20T11:35:44Z <p>This is Debian 9 Stretch speaking, <code>#1 SMP Debian 4.9.110-3+deb9u4 (2018-08-21)</code>, with a new, portable installation of Firefox 62.0 run from <code>/opt</code> with</p> <pre><code>$ which firefox /opt/firefox/firefox </code></pre> <p>My problem is that, even though the command</p> <pre><code>$ firefox </code></pre> <p>does launch and run a firefox instance, a subsequent command</p> <pre><code>$ firefox any.kind/of/url </code></pre> <p>fails with the famous window message</p> <blockquote> <p>Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.</p> </blockquote> <p>whereas it used to just open a new tab for the provided url in the existing, running session.</p> <p>The options <code>--new-tab</code>, <code>--new-window</code> or <code>--no-remote</code> do not help. And I have checked according to <a href="">this post</a>, that</p> <pre><code>$ echo $MOZ_NO_REMOTE 0 </code></pre> <p>.. which I think should mean that my desired behaviour is the expected behaviour. (Note that it is not clear to me what is the <code>init</code> file they refer to in this post).</p> <p>As (I-think-)related problems:</p> <ul> <li>clicking a link in a <code>.pdf</code> file opened with <code>evince</code> also fails with the same error message.</li> <li>cliking a link in an e-mail viewed in thunderbird also fails with the same error message.</li> </ul> <p>Am I missing anything here?<br> How do I add a new tab to the running browser session from the command line?<br> Any way to solve / get around this problem?</p> 0 Where do I find the stylesheets for Mozilla firefox developer tools themes user254694 2018-05-09T08:48:25Z 2018-09-20T05:00:01Z <p>The mozilla firefox developer tools has two different themes, a light and a dark. The dark is the default theme for Firefox developer, the light is the default theme for the normal Firefox. </p> <p>I would like to find the actual stylesheets (assuming that these are styled with stylesheets) to edit them. I am on Windows currently and I assume that since I cannot find them in appData that they must be inside some .exe or.dll that I can access using resource hacker. </p> 0 Where does Firefox highlights get its images from? Milliron X 2018-09-19T21:06:11Z 2018-09-19T21:06:11Z <p>Overall, I like the new Firefox "highlights" feature of the New Tab Page. For most pages that appear there, the first image on the page or a high-res favicon becomes the image on the highlights badge. But for a few websites, this is not the case.</p> <p><a href="" rel="nofollow noreferrer"><img src="" alt="Example Highlights Entries"></a></p> <p>I took this screenshot after browsing to</p> <ul> <li><a href="" rel="nofollow noreferrer"></a> and</li> <li><a href="" rel="nofollow noreferrer"></a></li> </ul> <p>Neither page contains the image shown on the badge. I've also checked the network tab in developer tools, and these images don't appear as requests there, either.</p> <p>Where is Firefox pulling these images from?</p> 4 How to disable mouse back and forward shortcuts? user598527 2017-09-04T20:41:53Z 2018-09-19T15:08:36Z <p>Mouse's buttons 4 and 5 operate as back and forward shortcuts in Firefox. Accidentally pressing these buttons has been common with every mouse I've owned and has resulted in severe issues with banking websites and job applications. I don't want to disable the hardware keys because these extra buttons are useful especially in games with complex control schemes.</p> 5 How long does chrome & firefox cache a file if no "expires" or "max-age" tag is set? skerit 2013-12-13T10:47:57Z 2018-09-19T15:01:10Z <p>I would like to know what the default max-age is of an image or css file, but can't seem to find it anywhere.</p> <p>Someone suggested it was only 300 seconds, but that doesn't seem to be correct.</p> -1 Firefox does not trust Windows certification authorities anymore [on hold] Martin 2018-09-19T13:03:14Z 2018-09-19T13:03:14Z <p>I am in an enterprise setting with an enterprise proxy doing https inspection, ie using a custom certificate. The certificate is in the local cert store on Windows.</p> <p>Some weeks ago, Firefox stopped trusting the additional certificates and will throw errors at every encrypted page. Everything still works fine in IE and Chrome.</p> <p><code>security.enterprise_roots.enabled</code> is set to true, yet it does not seem to load the certificates.</p> <p>I tried importing the certs manually, but that doesn't seem to work either - I click import, select the p7b file, and nothing happens - no error message, but the cert also does not show up in the list (or I'm looking in the wrong place). </p> <p>Browser Console does not show anything suspicious. </p> <p>Any ideas how to fix this? Is there any way to check if Firefox actually finds the certificates in the Windows store? Should they show up in the Certificate list or in the crypto modules?</p> <p>I am on Firefox 62.0 64bit on Windows 7.</p> 0 Redirect specific files on webpage load [on hold] H. Soda 2018-09-19T12:35:33Z 2018-09-19T12:52:05Z <p>I'm trying to redirect specific files from a website, such as loaded JS, css, images.</p> <p>For example, redirecting google.com* to localhost/google.png</p> <p>I've tried messing with the Redirector addon for Firefox but it only seems to work with URLs typed in the address bar. It won't work for files requested during page load.</p> <p>What would be a good way to do this?</p> 3 Multi-row tab bar in Firefox Quantum gerrit 2018-08-23T16:51:42Z 2018-09-19T11:56:15Z <p>Firefox Quantum <a href="">breaks tab mix plus and tab kit</a>. Is there any way to get a multi-row tab bar in Firefox Quantum?</p> <p>If possible, I'm looking for a supported, stable solution, that is unlikely to break at the next new version.</p> 0 Firefox Video format or mime type is not supported Sanjay Manohar 2017-08-08T22:01:47Z 2018-09-19T11:00:18Z <p>I want to open <code>.mov</code> files from Firefox in VLC. </p> <p>On my <code>Options/Applications</code> there is no item in the list for <code>mov</code> or video. </p> <p>The firefox help says "click on the mov file and select the application". When I click on a <code>.mov</code> file, it goes straight to a grey screen with a video icon, and the message: <code>Video format or mime type is not supported</code>. Firefox does <strong>not</strong> ask what to do with it, even though everything in <code>settings/applications</code> is set to <code>always ask</code>. In <code>options/general/downloads</code>, I have checked <code>Always ask you where to save files</code>. If I right-click a <code>.mov</code> and use <code>save link as...</code>, I can save the file and open it in VLC, no problem.</p> <p>I'm using Windows 7, if that matters. In the firefox console, I see </p> <pre><code>Media resource http://.../ could not be decoded. </code></pre> <p>And if this is relevant, the server header is <code>Content-Type: "video/quicktime"</code></p> 5 Is it possible to view a page in Firefox using "print" media type? gaazkam 2016-08-14T20:11:10Z 2018-09-19T04:26:09Z <p>I'm not talking of the Print Preview - I mean to view the webpage in Firefox "normally", with access to e.g. the F12 Developer Tools, but I want the layout to be the same as if I was printing the page out.</p> 2 How to sychronize bookmarks with Microsoft Edge? Michael S. 2015-08-09T08:01:12Z 2018-09-18T23:00:35Z <p>Currently I am using <a href="" rel="nofollow noreferrer">XMarks</a> to sync all my bookmarks between work and home and also the browsers Chrome, Firefox and Internet Explorer. This works as intended. Now I want to start using Edge. I can import from Internet Explorer and have my favorites now in Edge. But when I add a new favorite to Edge this will not be synced back to the other browsers. Any solution for this?</p> 0 Firefox "Open Containing Folder" launches Filelight instead of file manager. How to fix? KlaymenDK 2018-09-18T06:14:58Z 2018-09-18T06:21:18Z <p>I somehow changed which app is triggered by the "Open Containing Folder" option on downloaded files (as viewed in the download manager), so it now launches the Filelight disk-space-distribution viewer instead of my default file manager (Caja). This is not exactly useful.</p> <p>How do I fix this? Where exactly is the setting for this app association?</p> <p>I've tried following the advice from <a href="">this question</a> about removing Filelight to force Firefox to ask which app to use -- but now it just tries to open files with Audacious (an audio editor)! Re-installing Filelight reverts Firefox to using that again, but I didn't get the "open with" dialog.</p> 0 is it possible and if so, how do i change the size of the firefox/waterfox titlebar/buttons? Jevak 2018-09-18T02:19:51Z 2018-09-18T02:19:51Z <p>I've been trying to scale the size of the title bar buttons down as they take up too much space imo. I've even tweaked the windows registry to scale the default windows title bars down, but the buttons on the browser are not effected by that change. this picture here will better explain what I'm trying to do.</p> <p><a href="" rel="nofollow noreferrer"></a></p> 1 Firefox native support for userscripts - without addons Azevedo 2018-09-17T18:43:56Z 2018-09-17T19:41:42Z <p>I want to run some custom userscripts in Firefox but without add-ons like Greasemonkey.</p> <p>A long time ago it was possible to do so by putting scripts in a folder named <code>userscripts\\</code> inside the Firefox user profile. I tried it but I think it no longer works.</p> <p>So, is it possible to run userscripts in Firefox without installing add-ons?</p> 2 Firefox: H.264 Video Support Antonio 2014-12-12T14:18:59Z 2018-09-17T18:48:26Z <p>I have Firefox 34 and <code>OpenH264 Video Codec provided by Cisco Systems v1.1</code> addon installed and enabled.</p> <p>The problem is that Firefox can not play H.264 video. I used <a href="" rel="nofollow noreferrer">this page</a> for testing and here is the screenshot:</p> <p><img src="" alt="h264"></p> <p>Also, I tried to test my browser using <a href="" rel="nofollow noreferrer"></a> and it does not detect H.264 as well:</p> <p><img src="" alt="enter image description here"></p> <p>Am I the only one who has this problem? Why does Cisco H.264 codec does not work?</p> 29 Copying unicode symbols from Firefox address bar as is Mirzhan Irkegulov 2012-09-28T07:46:30Z 2018-09-17T17:12:52Z <p>Let's say I open a webpage with some Unicode characters, say, Cyrillic, in the address like this:</p> <blockquote> <p><a href="">Функциональная_закреплённость</a></p> </blockquote> <p>When I try to copy it from the address bar somewhere else, it becomes unreadable rubbish:</p> <blockquote> <p><a href=""></a></p> </blockquote> <p>I guess this is for compatibility. However for readability I want to copy it straight away with proper Unicode characters.</p> <p>What and how should I tweak to make that possible?</p> <p><strong>Edit:</strong> The answers are good, but they are hacky. Are there any settings in <code>about:config</code>?</p> 0 Sound Won't Play on Any Browser Carly Sue 2018-09-17T00:21:49Z 2018-09-17T00:21:49Z <p>Recently I've noticed that shortly after startup that sound breaks on browsers, but sound works properly everywhere else. Videos and audio suddenly take longer to load, and then proceed to play silently, or not at all on some sites.</p> <p>My browsers are up-to-date, it's not muted in mixer, I've cleared my cache, and I've made sure that "Play sound in webpages" is enabled in internet properties. I haven't made any recent changes beyond making Firefox my default browser. Restarting the browser doesn't fix it, I have to restart the computer.</p> <p>I've found that I could prevent this by having audio play endlessly in a tab and just mute the tab if I want to do something else, but if it's not the first thing I do I'm stuck restarting to fix it.</p> 80 How to block Hot Network Questions in the sidebar of Stack Exchange network? Aquarius_Girl 2016-12-19T06:13:23Z 2018-09-16T17:41:46Z <p>Operating system is Ubuntu 14. Firefox is 50.1.0</p> <p>This is what I have tried:</p> <p><a href="" rel="noreferrer"><img src="" alt="enter image description here"></a></p> <p>I restarted firefox after that. There was no effect.</p> <p>What is the way to block those hot questions on the sidebar?</p> 0 How can I disable the focus ring in the firefox settings? Busti 2018-09-16T15:16:01Z 2018-09-16T16:34:28Z <p>When an element is in focus, firefox automatically gives it a dotted outline, to show that the element is currently focused.<br> This can be really useful when navigating webpages with a keyboard and increases acessability a lot. </p> <p>It however also looks rather ugly and when I am navigating the web using a Mouse, I would like it to not show up whatsoever. </p> <p>There already are a lot of questions and answers on the web on how to disable these outlines using css, and the answer often is </p> <pre><code>:focus {outline:none;} ::-moz-focus-inner {border:0;} </code></pre> <p>I would however like to disable this dotted outline everywere, not only on pages where I can edit the css, <strong>preferrably by changing a simple browser setting.</strong></p> -2 Why do in the latest versions of all modern web browsers the character encoding option is missing? Or has it been removed from all modern browsers? [closed] JSLover 2018-09-16T10:55:59Z 2018-09-16T11:01:38Z <p>Why do the latest versions of modern web browsers like Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, etc. are missing the 'Character Encoding' option?</p> <p>Is there any change in the web standards responsible for the this removal?</p> <p>I want to know the exact reason behind this removal.</p> 0 How are the Icons for "top sites" in the firefox new tab rendered? Prem 2018-09-14T19:21:38Z 2018-09-15T11:34:24Z <p>When I open a new tab in firefox, I get the top sites based on my history, or based on what I select to be shown.<br> One row from that list of top sites is shown here.<br> Some are simply <strong>rectangular</strong> (eg yahoo finance,, while some are having a <strong>smaller rectangle</strong> at the bottom corner (eg google news, yahoo mail).<br> Some are simply the <strong>single starting letter</strong> (eg N, Y), while some are having the relevant <strong>favicon</strong> (eg whatsapp,</p> <p>Why such variety ?<br> <strong>Why firefox treats Different sites Differently ?</strong></p> <p><a href="" rel="nofollow noreferrer"><img src="" alt="One row of top sites in the firefox new tab"></a></p> -1 Cisco RV180W has an invalid certificate; cannot access with Firefox or Google Chrome, how do I fix this? Yanick Rochon 2018-09-13T19:53:35Z 2018-09-15T11:14:43Z <p>I need to perform a very simple task on a RV180W router, but the new "security" features prevent me front either login (with Firefox) or view the user interface (Google Chrome) because the certification is invalid.</p> <p>How can I ignore these restriction since I'm on a LAN, accessing ?</p> 22 How to prevent Firefox converting 'localhost/*' URLs into search queries? danjah 2012-01-27T02:36:18Z 2018-09-15T01:16:26Z <p>Since upgrading from Firefox 3.6.x, my address bar has a quirk that never used to be there. When I type in, for example:</p> <pre><code>localhost/my_dir/index.php </code></pre> <p>Firefox turns it into a search query, my search engine is Google. To work around this (after forgetting I need to do this almost every time for FF), I must type in:</p> <pre><code>http://localhost/my_dir/index.php </code></pre> <p>This way, I am directed correctly to my localhost server. I don't need to do this for any other browser, and I thought <a href="">this Q/A on URL trimming</a> might change the behaviour, but it didn't.</p> <p>Any ideas on how I can prevent 'localhost' from being turned into a search query?</p> 9 List open Firefox tabs from the command line? kenny 2011-04-11T14:35:30Z 2018-09-14T14:05:22Z <p>Is there a way to list the open tabs in Firefox from the command line?</p>