Firefox Support Forum

Embedded videos missing in Firefox but show up in Microsoft Edge. How to fix it?

Example: https://scheerpost.com/2024/03/09/you-are-betraying-your-ancestors-a-message-to-joe-biden-from-the-graveyard-where-his-ancestors-are-buried/

I run Firefox on a Dell laptop running Windows 10 Pro. I had to rebuild my system because of problems I couldn't solve. I've reinstalled Firefox and copied a profile I had saved in the cloud. When I click the extensions button ("puzzle piece") I do not see the extension list, only the add-ons page. do I have to uninstall and reinstall each extension to get it into the panel so I can pin some of them to the toolbar?

In about:config I set browser.urlbar.clickSelectsAll to true and browser.urlbar.doubleClickSelectsAll to true

Now, single clicks in the address bar select the entire URL except when the address bar contains an address provided by New Tab Override. Does anyone have a fix for this issue?

Thanks.

I want to disable notifications when a download is finished, however the key in about:config 'browser.download.manager.showAlertOnComplete' does not exist any more. Is there some other way to disable these notifications?

I have a current version of Firefox (v123.0 running on Windows 10) but I can't do what I used to be able to do? (And it is making me nuts!)

I used to be able to resize the contents of a site - such as youtube or wordpress or tumblr - there would be a little % on the far right of the URL bar, and I could adjust that until the site was readable and all the pieces I wanted fit in. I can't find a control that will change this for me in the new version. Is it somewhere else? Did that control not port into the new version? Is is gone for good? (I really hope not!) I realize this is such a small problem, but it affects how I interact with basically every site online.

What makes this extra frustrating is that I'm not even certain I am using the correct terms for the thing I want -

Thank you for your patience -

Lee Thomson dancingcrowdesigns@gmail.com

Hello there!

I have been trying to edit an existing browser extension (for the sole reason of adding new features to it for myself), and I've been trying to add it to my Firefox browser. However, upon trying to install it to the browser, it throws an error saying: "Installation aborted because the add-on appears to be corrupt". I've been trying to read more into this issue all across the internet, but none of the recommendations seem to be working.

I tested my extension locally and with using the about:debugging temporary add-on method, and everything seemed fine.

I tried to re-configurate the 'xpinstall.signatures.required' variable by setting it to false (even thought this method is considered unsafe in most cases), and the issue still occurs

I also tried adding a new gecko ID to it as stated in this article, but to no avail: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_specific_settings

And last, but certainly not least, I tried compressing the extension with web-ext aswell.

My question is - is there a way to add this extension permanently to my browser without submitting it to Mozilla? I did not create this extension, I only added custom integrations to it for myself.

And more importantly - is there a way to add it to the basic Firefox browser, which is not Firefox developer of Firefox nightly? Or maybe create a desktop shortcut that will always start the browser in debug mode, always containing the extension as "temporary"?

I can see that many posts and questions have already been posted regarding this "custom add-on" topic, but my situation is a bit different since my goal is to only use this add-on by myself (and I'm also revisiting this topic since none of the previous suggestions worked in my case)

Any comments, helps, or even links would be greatly appreciated! Have a great day!

How can I restore a previous theme? I had a "colorfore" theme that Mozilla offered a few years ago set up in Firefox. It was perfect! I could see everything clearly with my aging eyesight.Then one of my synced computers needed a new Linux OS installation so I signed out of sync on that machine. Installed the new OS. When I started Firefox the first time I signed into sync. I got my history, bookmarks and bookmark bar, but no custom colors. Now my computer at work has its colors reset to the out of box colors too. I have lost the colorfore colors I have been using for several years now. How can I get the colorfore colors back? Thank you for your attention in this matter. I love Firefox, use it exclusively and contribute to Mozilla. Gregg Scholfield

When typing if I make a mistake I'll usually just delete the entire word and retype it rather than fix the spelling but to do that I need to use CTRL. Now when I press CTRL it zooms in the page even though there are no other buttons being pressed.

As I understand, `autoconfig.js` (with `firefox.cfg`) can be used to have JavaScript run during startup to control Firefox's UI elements.

I have set up `autoconfig.js` in my `/usr/lib/firefox-developer-edition/defaults/pref` folder (I'm on EndeavourOS Linux). As instructed here, I've already put the two required files, `autoconfig.js` and `firefox.cfg` in their correct folders (`/usr/lib/firefox-developer-edition/defaults/pref` and `/usr/lib/firefox-developer-edition` in my machine).

The file `firefox.cfg` contains the following code:

 //
 (() => {
   var tabbar = document.getElementById("TabsToolbar");
 })();

However, every time I run Firefox, this message will appear:

 "Failed to read the configuration file. Please contact your system administrator."

If I empty out the `firefox.cfg` file, Firefox will run normally without showing the error message. It will also run normally if I just have something like this in the file:

 //
 (() => {
   var testVar = "";
 })();

I don't understand why the JavaScript code can't access the Firefox UI elements through `document` or `window.document`. If `autoconfig.js` isn't build for that, what should I use to change my browser's UI elements through JavaScript?

Thank you.

Starting with Firefox version 120, you can set Firefox to automatically launch whenever you start or restart your Windows computer. https://support.mozilla.org/en-US/kb/open-firefox-automatically-when-you-start-computer

The browser shows opt-in prompt for the user to easily setup this behavior. However, I do not want to do this.

When I click "No thanks", the prompt goes away, but couple days later, it returns. I guess that an update resets the prompt status.

Is there a way to permanently disable this opt-in prompt without allowing Firefox to start automatically with the computer?

I want to disable the "language-aware word selection when double-clicking on text" feature that shipped in 122.0 (https://www.mozilla.org/en-US/firefox/122.0/releasenotes/)

This new feature is cool, but it has actually slowed down the speed at which I select text. Originally, I could double-click to select an entire sentence, but now a double-click only selects a single word.

It would be great if there was a way to disable this feature for a specific language.

Thank you.

There used to be an extension called "IE Tab". It allowed you to right click on the link, and open the site in a tab, using Internet Explorer, for sites that didn't work properly in Firefox. I was wondering if anybody knows of any similar extension that would do the same for Edge? I can't open Twitter (X) using Firefox anymore, but I can open it using Edge. I don't like Edge (obviously), but I have no choice. Thanks in advance!!!

Hi,

I'm trying to remove the bar at the top of firefox browser with tabs in them. I read another article (https://support.mozilla.org/es/questions/1417387#answer-1588947) under spain link, i think, and the solution said to write "TabsToolbar-customization-target { visibility: collapse !important; }" somewhere. Where do I go to write that?

I tried the console by pressing f12, but that doesn't seem like that's it. In that article it also mentions to go to about:config and change the status of "browser.tabs.drawInTitlebar" to false, or delete it, but didn't work either.

How can I completely remove the tab bar and regain 3/4 of an inch of screen space. It would be nice if Mozilla would just have a on/off button for it. I've tried creating a folder called Chrome within my Firefox Profile folder. I then created a text file within that folder and named it userChrome.css. I put this string in the text file #tabbrowser-tabs { visibility: collapse !important; } This did not work, does anyone know the best method for getting rid of the annoying tab bar?

Thank you

I have Firefox as my default browser instead of Microsoft Edge on my HP laptop. I've tried everything under the sun to make Google my default search engine over Microsoft Bing, and no matter what it won't stop rerouting me to Bing. I can go to www.google.com and type directly in the search bar and it STILL reroutes me to Bing, even when my settings list Google as my default search engine of the search bar. Can I block Bing as a website altogether? HP support only offered to connect me with a specialized team that costs money. Please help.

Saved themes in Firefox color not visible in add-ons manager. Does not fix itself in safe mode. One of the saved themes is a default preset I liked, the other is a preset I made myself, using all options except advanced colors.

Hi there,

On Firefox, I'm experiencing "momentum" scrolling where, when I scroll using the trackpad, after I lift my fingers off, it keeps scrolling for a bit.

This is not the same thing as smooth scrolling. Disabling smooth scrolling does not disable this behaviour, and I use smooth scrolling on plenty of programs without it experiencing this "sliding" "momentum" on any of them except Firefox. I've also used Firefox before with trackpads without experiencing this.

How can I disable this?