Firefox Community Forum

I can't open FIrefox. When I try to open it I get the following error message. "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." I opened Task Manager and could not find any instance of Firefox or Mozilla running. I uninstalled Firefox and deleted all the files and folders having to do with Mozilla and Firefox. Then I reinstalled Firefox. I continue to get the same error message. I am running Windows 11 64bit on a Dell laptop. Any suggestions? Ray

I'm trying to sync my tab groups across my desktop/laptop. I have sync enabled through the settings and I've checked every box, but I don't seem to see an option for syncing tab groups specifically. It syncs all of my bookmarks and active tabs, but the groups seem to be unique to each device. Is this feature available? I might be looking in the wrong spot so if anyone has any insight that would be great! Cheers

How do I enable syntax highlighting when viewing the mark up of a web page, using the "view-source" functionality of the current tab.

It no longer works for me, I need to use this feature so I can find errors in my HTML markup.

Does the "view-source" feature have any optional settings available to the user and how do I find them using the about: option

TIA.

can not resolve repeated problem : "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem." Cánt not find "Refresh"

I’ve been testing how different browsers handle redirects and external triggers from game-related tools, and I’ve noticed something odd with firefox. When trying to launch certain experiences or apply custom settings from external links, firefox doesn’t always behave the same way as chrome or edge—it sometimes blocks or ignores the flag triggers completely.

for example, I’ve been working with a roblox-related launcher that uses something like a fast flag through bootsrap to customize the client experience. everything works smoothly in edge, but firefox seems to either strip the flags or block the redirect entirely.

is there a setting I should look into that might be interfering with these calls? could enhanced tracking protection or strict HTTPS enforcement be playing a role?

would appreciate some help....

I have selected Duck Duck Go as my default search engine in the settings for Firefox. But when I open my Firefox browser it shows the MS Bing homepage and NO drop down box for other search engines. How can I fix this? This is an initial installation of Firefox on a new Acer Aspire computer running Windows 11.

For several months I have been getting all these woke "news" popups from Firefox in the bottom right corner of my PC screen. I use firefox as my default browser and don't feel like uninstalling, but soon I will have to because it is so annoying when I am trying to play a game and firefox comes along and tries to brainwash me with its woke agenda. I mean, today it's giving me a popup telling me to go plant-based for a month, WHEN IT'S LITERALLY CARNIVORE MONTH. HOW DO I REMOVE THIS BULL****!?!?!?

For some reason text rendered in canvases (used by Minecraft hostings to display console) is distorted. I'm not getting this behavior in other browsers (including Zen – Firefox fork). The issue persists in both stable and nightly versions, with and without hardware acceleration, in safe mode too. Any clues?

Internet searches for Firefox support/forums shows https://www.mozilla.org/en-US/about/forums/ and https://www.mozilla.org/en-US/about/governance/policies/participation/

Searching around these links is too difficult to find where to post any questions, which happens to be on this link https://support.mozilla.org/en-US/questions/

Please make UX friendlier.

I'm using Ubuntu 24 with the XFCE desktop. I'm installing the debs straight off packages.mozilla.org (currently 143.0.3).

Firefox's title bar, and window manager buttons do not have the same look and feel as the rest of my windows. And I have no idea where they're coming from.

They do change appearance in response to picking the different styles in Settings > Appearance, but the changes appear to be limited to colors only. The minimize, maximize and close buttons look differently than on all other windows, and they are more spread out than in, and the shade button is nowhere to be found.

I'm attaching two small images, the first one is the standard set of widgets all other windows have, and the second one is Firefox's odd duck. I could not find anything in settings. "Extensions And Themes" shows that "System theme" is enabled. Well, it's coming up a bit short...

Since a few months ago the newtab page layout has been changed. The site icons are now smaller, leaving a wide margin on the page. In my opinion this margin is too wide and looks strange. Is there any way to change it back?

See the OLD and NEW layout in the uploaded images.

Alternative search engines no longer appear when typing the stasrt of a search. Am able to set alternative search engine in settings but need to go back to settings if I want to use another one. This happened after a recent update - perhaps as much as a week ago.