Firefox Community Forum

Hello,

I wanted to customize my Firefox new tab with a local HTML file, such as "/path/to/my/index.html". It was possible to use this workaround: https://github.com/Jangsoodlor/Firefox-New-Tab-Config/tree/main https://github.com/Jangsoodlor/Firefox-New-Tab-Config/tree/main

Which implied a configuration file (sometimes named "autoconfig.cfg", "firefox.cfg", "local-settings.cfg" depending on the guide since the name is arbitrary) with javascript code. In the new Firefox 136, this code fails to execute due to a new API being used.

If you want to customize your new tab, follow the previous guide, but on the configuration file write this code instead:

// My new tab
try {
  const ff = {};
  ChromeUtils.defineESModuleGetters(ff, {AboutNewTab: "resource:///modules/AboutNewTab.sys.mjs"});
  ff.AboutNewTab.newTabURL = 'file:///path/to/my/index.html';
} catch (e) {ChromeUtils.reportError(e);}

Note that the file must start with a comment

Adapting the "/path/to/my/index.html" to your needs.

Thanks to @mkaply (github) on this thread https://github.com/mozilla/policy-templates/discussions/1190 for the new API method.

I post this here in case someone has the same issue, because is quite recent and hard to find on the internet.

hi, spellchecking works fine when using Firefox in Linux, but not in Windows 11. For instance, I can enter comments and replies to magazine articles while using Linux and they're spellchecked as I go by highlighting misspelled words etc, but if I'm in Windows 11 and on the same comments section, although my Firefox settings are the same the spellcheck doesn't happen. Can anyone please tell me what's up with that?

System Windows 11 - Firefox 151.0.3 All normal actions from mouse right click have disappeared eg open link in new tab or private window, copy, paste etc etc. The Settings General - Tabs has not changed and previously worked rt click ok. Any help to restore the rt click function will be appreciated.

New installation of Debian 13, Firefox setup with sync on successful. However, I wanted to add hone button and a few other mods to the toolbar but when I started customize the toolbar from menu pic the customization page would not work, it appeared and seemed OK but when I dragged and dropped anything it would not work. I could pickup items but they would not place in toolbar and just snapped back to the pallet. I tried several different ways to enter the customization area but it was always non-functional.

I opened Firefox today to find that nothing would show up, at first I tried clicking on the icon on the taskbar, but it just made the icon bounce with the window briefly popping into view. That's when I realized that Firefox was completely offscreen and unusable.

For context, last night, I had 3 windows open, two were regular sessions, the last one was a private session I had open on a temporary second monitor that I unplugged afterward. My dad lended it to me, so I'd rather not ask him again unless I absolutely have to. I closed them in order making sure to close the default window last thinking that Firefox would open there next time I launch it, but comes tomorrow and when I launch Firefox it opens off-screen and I can't interact with the window at all.

There also seems to be no way to bring it back directly to my screen on this garbage OS everyone calls "windows 11" according to their help forum: https://learn.microsoft.com/en-us/answers/questions/4139775/app-runs-off-screen-in-windows-11?page=2#answers

So, I'm commenting here via brave browser, first to report a bug because I don't think Firefox should remember the last position of a private window of all things, but also because I don't know where else to go to ask that question since windows 11 itself cannot seem to have an option to solve this problem either. I know the position is stored in the profile folder, so what should I edit in there to get Firefox back where it should be? No, I will not delete/reset it it has a ton of search engines and settings that Firefox won't sync.

not a real question and not waiting for answer.

the "Open all in tabs" menu that appears at the bottom waiting for you to click on it by mistake. we need a way to remove that option while also disabling the middle button over the folder to open all bookmarks over the tabs. It also should be a default because been using firefox since version 1 (previously Netscape Navigator back in 1998) and I rarely had the need for something like that.

Firefox under linux x64 v 148.0.2

Linux madcat8.local 6.12.30 #1 SMP PREEMPT_DYNAMIC Thu May 22 18:38:20 CDT 2025 x86_64 Intel(R) Core(TM) i9-14900K GenuineIntel GNU/Linux

asked chatgpt and it suggested some fixes but apparently userChrome.css is actively being ignored. from the look of things, seems like I will have to stick to an specific version like I had to do with Thunderbird after version 102 where ugly UI changes were implemented.

have fun.

Device name DESK Processor AMD Ryzen 3 3100 4-Core Processor (3.59 GHz) Installed RAM 16.0 GB System type 64-bit operating system, x64-based processor

Edition Windows 11 Home Version 25H2 Installed on 12/01/2026 OS build 26200.7623 Experience Windows Feature Experience Pack 1000.26100.275.0

Hello,

I have two windows in Firefox that I would like to tile so that I can compare the contents of each. Is this possible ? Regards

pyor66

Hi I see that Firefox has the option to ask an AI chatbot, with your options for AI being Claude, GPT, Gemini, and Le Chat Mistral. What I'm not seeing is an option for Lumo, Protons new chatbot. My question is is there any future support coming for Lumo, or better yet, an option to let FF users choose ANY chatbot, not just these 4?

(srry if wrong topic) basicly when i use the customize firefox tab it tells me about the overflow menu but when i try to add BUILT-IN tools like zoom control it just, not, and also the overflow icon apears gray'ed out,

if someone can help me with this then pls reply to this, ill come back to this post like a week later

There is a 'feature' in Firefox that I think is called "click and hold context menu". Basically if you left click on something and hold the click for a second or two a menu appears that offers an AI generated list of suggestions related to the thing you were clicking on. How do I disable this? In searching I have found suggestions to open about:config and set the value for ui.click_hold_context_menus to false, which I have done a few weeks ago now and it has no affect. I also tried changing the related value of ui.click_hold_context_menus.delay to an insanely long time, but that also had no effect.

I would appreciate some guidance on how to turn this off. This is problematic enough that I may have to switch to another browser if this can't be disabled. Thanks! Attached is a random example of one of these context menu's that appears when clicking and holding on a link.

Is there a button I push or a feature I enable to make sure that I'm opted-out of any future updates that include AI 'features'? Or should I switch to Vivaldi now and save time?

Hello, I'd like your help. I'd like to disable some unnecessary options from the Firefox right-click menu. 1. Open link in new tab 2. Open link in new container tab 3. Open link in new private window 4. Save link as 5. Copy link I don't need these five options, so I'd like to disable them if possible.

Thanks to the help received here and in the Reddit group I've been able to transfer almost all of my old colour and layout tweaks to a new intallation of Firefox (v133) on a new PC (running Windows 10). There's one thing that I haven't succeeded with though: I'd like to change the colour of the text in a tab when that tab becomes the active one.

This is the coding I'm using to change the tab's background colour when it's selected:

1. TabsToolbar .tab-background[selected]{

background: white !important; }

This works perfectly. But when I tried adding the line

color: black !important;

It had no effect. I'd be grateful for any thoughts. Many thanks.

There seems to be no rhyme or reason as to what Firefox keeps in the address bar drop-down, sometimes websites I visited once for a specific reason will stay there for literal months, and websites I go to often don't show up at all, or vanish after a few days (during which I will be actively clicking on them, no less).

I know it's probably a bit weird, but I actually like keeping several specific websites in the drop-down menu, it makes it easy to navigate to them without cluttering my bookmarks (any more than they already are). How do I keep specific websites in the address bar's drop down?

`StartupWMClass=firefox-aurora` in `/usr/share/applications/firefox-devedition.desktop`, with actually `firefox-dev` for opened windows.

Version: Ubuntu 25.04, GNOME 48, firefox-devedition 143.0b2.

I've found out that you can create custom prompts for the AI sidebar with the configuration `browser.ml.chat.prompts.*`. Usually, this is done with the selection text. However, I'd like to pass the URL instead. I could use `%url%`, but that does not include parameters after `?` and hence does not work for Youtube.

Is there any variable that I can use to pass the full URL including parameters of the URL?