I-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.

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

(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

I'm running Firefox under Ubuntu, Ubuntu is using Wayland which replaced X11.

Firefox's User Agent string still refers to X11, this does not cause me any problem but I'm curious.

I realise some websites might be expecting to see "X11" and could get upset if presented with "Wayland" instead but in various walks of life telling the truth is often the best policy.

about:support in Firefox shows me:

User Agent Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:152.0) Gecko/20100101 Firefox/152.0 Window Protocol wayland

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.

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?

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?

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.

`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?

Something called "safe space" just showed up in my firefox browser... I didn't want it, didn't ask for it!! PLEASE tell me HOW to get rid of it.... PLEASE!!!

Moderator note: This question has been edited to remove excessive new lines.

When I inadvertently press CTRL + R when entering text, it is VERY frustrating because the window refreshed and I loose all of what I typed! Is there some way to disable the CTRL + R combo so the window does not refresh?

Thanks

Due to muscle menu or not needing to think about it. Split should either be near the bottom of the context menu or you should be able to toggle it in settings. The amount of times I have gone to click a link to open in a new window only to split the view is driving me crazy.

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?

On Firefox 128.14.0esr (build 20250811113756), Linux/X11, the setting browser.tabs.hoverPreview.enabled does change back to "true" every few days, or perhaps browser restarts.

How can I turn off tab previews reliably?

One of the websites I need for school requires pop-ups. I can't click on the button to permit pop-up windows for just that site because it only flashes for less than a second and it is grayed out. I tried to go to preferences to disable the pop-up blocker, but the checkbox to disable it is grayed out. I created a new profile, but the button to disable the pop-up blocker is grayed out on that too. I now have to use chrome for this website because I can allow pop-ups on that browser.

My question is why is this setting grayed out? And how can I re-enable pop-ups or at least edit the exception list because that is grayed out right now too. Any other tips for troubleshooting similar issues in the future would also be appreciated.

OS/Firefox packer: Artix Linux Firefox ver.: 142.0 (64-bit) Tested on brand new profile