Firefox Community Forum

For no apparent reason, all Firefox 140.0.4 on Windows 10 crashed and when it was relaunched it did not restore any open tabs, reverting instead to the home page. All history is gone, no previously open tabs are windows appear in the history list. This computer has syncing enabled.

I used about: profiles on the Win 10 machine and it only shows the one that is currently in use. I copied the 2 files found in the along with places.sqlite into a temp directory. I did a search for index.dat and it is not found on the Win 10 computer.

Even worse: another computer running Win 11 that is syncing with the Win 10 machine is also now missing its history. Is there a way to recover from this?

Note: I am generating this from the Win 11 machine, not the problematic Win 10 machine.

Several web sites say that they detect this ad block on my pc , but I can not find it through my pc sites. It seems to be kind of a worm that can not be disabled. I am using Firefox.

This happens often. I start Firefox, and on the home page is a list of articles linked to several different publications. So I'm generally already on a mission, but I think "I'll come back to that article later", and I go off to do what I logged in to do. And when I get back to the article a few minutes or hours later, it's gone! There is a new set of articles. The articles have all refreshed, and the one I wanted to read is gone. So can I see back to what that was? Or some other way to retrieve that article I never got to read before it went away?

I lost everything in a tragic housefire recently and I cannot remember the exact username I used for my Mozilla Account. Of course, this means I have also lost years of valuable Favorites and Passwords and Logins.

Is there anyway to find out what my login name was?

How can I open an ad on a one-time basis, as if there were an option when right-clicking?

Sometimes we search for something we want to buy. The ad is near the top of the search results and seems to be worth investigating.

But we can't open the ad. Our wonderful ad blocker is, like our guard dog, too zealous sometimes protecting us.

The answer I'm looking for is NOT to go into Settings, etc. That's swatting a fly with a sledge hammer.

recently some websites won't open. in other browsers sites open fine. problems with pinterest.com figma.com cleared the browser, deleted cookies and cache, reinstalled the browser everything opens in google chrome, i attach screenshots

To view my Firefox browsing history, I click the three horizontal lines icon (in the top right corner of the window) to open the Menu panel. I then click History then click Manage History.

How can I make the font larger?

(Ctrl++ does not increase the zoom-level) (Zoom does not increase the zoom-level)

I have a desktop PC Firefox 140.0.4 (64-bit) Windows 11

Hello,

I am having an odd issue where I see flickering bands of cyan/purple blocks whenever I scroll on a page with some video embeds. At first I thought it was related to refresh rates (240hz) as some pages flickers but it occurs at 60hz as well.

2560 X 1600 Resolution with 125% windows scaling

Steps to reproduce: 1) have settings above 2) navigate to https://store.steampowered.com/ 3) view a storefront with a video embed 4) zoom to 180% 5) scroll up and down past the video

Specs: 64GB Ram AMD RYZEN AI 365 Geforce RTX 5080

I have a MV3 extension I created that has a popup and data that is stored in sessionstorage and extension storage.

When I use the extension in a private window it does not work because data does not persist between each time I open and close the popup.

This causes problems, for example you have I have to login each time I open the popup, instead of the auth status persisting. It works fine in a normal window though.

Is there anything I can do that allows data for an extension running in an inPrivate window to persist. (Maybe some additional manifest code / changing the browser config)

I've recently swapped to Firefox from Chrome and I've noticed a huge hindrance.

I use a chatroom website and when I swap to the tab and begin to type, the first letter is randomly eaten/won't be entered into the text field.

For instance I was typing the word "What" and the text field only displayed "hat". Or when typing "Either" only "ither" appeared.

I thought this may have been related to a hardware acceleration issue but both settings did not work. So I started to look at Hotkeys but none of them should be interfering.

Some others have stated they have this issue too and I've been unable to find any solution. Any help?

Fix for RangeError: invalid language tag and client-side exceptions in Firefox on Linux

Hi everyone, I was experiencing persistent JavaScript errors in Firefox on Linux when loading certain modern websites (e.g., built with React or Next.js). The browser console showed messages like:

   RangeError: invalid language tag: "chrome://global/locale/intl.properties"

   A client-side exception has occurred (see the browser console for more information)
   React error #418 with minified stack traces

This happened even in Safe Mode, with all extensions disabled, cookies/cache cleared, and Enhanced Tracking Protection off. ✅ Root cause and fix:

Turns out the issue was related to missing or broken locale configuration in Firefox. To fix it:

   Open about:config

   Create a new string entry:

       Name: intl.locale.requested

       Value: en-US (or fr, en-GB, etc. — any valid locale)

   Restart Firefox

After adding this key, all affected pages started working correctly. The invalid "chrome://global/locale/intl.properties" error in intl.accept_languages disappeared as well — it seems that was just a side effect of the missing locale setting. 🔁 Summary:

If you’re seeing RangeError: invalid language tag and React crashes, try adding intl.locale.requested manually. This fixed the issue entirely for me on Linux.

Hope this helps others!