I-Firefox Community Forum

your device identification does not tell me which devices you are actually identifying. You identify 4/5 devices, but I only have 2. - a new Nimo laptop (Rdn-Can68) and another relatively new Acer Nitro 50 desktop. Not sure what tag you have given for it. Previous systems failed and are gone. Some clarification would be nice!

Hi, I wanted to reduce height of tabs and remove borders in file userChrome.css.

So far this works for height, but was wanting to know if a negative value can be used to reduce further, Also tried some code to remove radius but it didn't work. Remove radius for selected tab and also hover on tab.

/* REDUCE HEIGHT OF TABS (VERTICAL TABS) */ .tabbrowser-tab { min-height: var(--tab-min-height) !important; max-height: var(--tab-min-height) !important; }

Hi, I set up the vertical tabs and I like them. However they're very unstable and so is the tab sidebar. The expand on hover feature only works for a short time. Then the x to close a tab disappears and the sidebar gets stuck open or closed. If it gets stuck open, it covers the settings and AI and history sidebars so I need to close it manually to use them. Yesterday I lost 3 of my 6 pinned tabs. After closing and opening FF, they were just gone.

Also my tab groups will suddenly disappear. This started in the previous version and still happens, and I lose the sites I had collected. Plus FF has been very slow to load.

So yesterday I gave up and reverted to horizontal tabs. Like magic FF suddenly worked perfectly and very fast. I'm not enough of a techie to have any idea of what is causing what and would really appreciate any advice.

I have loaded Firefox on another IMac and when I scan a document I lose the browser. I would like the browser to stay on the desktop so that I can attache the document direct to my email

If I have vertical tabs enabled, and tabs sidebar uncollapsed it will unexpectedly change to collapsed if I reorder a tab via drag and drop. See attached gif.

Firefox 143.0 (aarch64) MacOS Sequoia 15.6.1 (24G90)

I just finished describing in detail a problem I have uncovered. Just before posting I clicked on an offered link that said it would help provide Mozilla with info about my system, and doing that nuked everything I'd written. So now you just get the short version - For a very long time Firefox has failed to interact properly with Apple's "Pages" app in their iCloud environment. Specifically, Command + C + clicking on selected text does NOT result in the text being copied. I'm done with Firefox.

When I close a tab, and try to find it in the recently closed tabs in the history, some i just closed, and without opening even a few others, they do not show up in the recently closed tabs list, while some I closed the day before are in there even when I filter to "Today" and that after" using Firefox for less than an hour and only had.

For one I think Today doesn't do that but rather the last 24 hours or similar.

It actually has been a problem for a very long time.

I can find most of them in the "Show all History", but that defeats the purpose of the recently closed tabs option.

I am using 143.0.4 (64-bit) AKA archlinux - 1.0, on Arch Linux I update every few days.

In my case today it was a Duck Duck Go search results page.

Environment - Device: Acer Neo 16 (PHN16-71), 2023 model - OS: Windows 11 23H2 (Build 22631.4974) - Browser: Firefox ESR 128.7.0esr (similar issue observed on 140esr) - Current version in use: Firefox ESR 143.0.4 (64-bit) - Graphics: Hybrid – Intel UMA + NVIDIA RTX 4060 - Drivers:

 - Intel UMA: 31.0.101.4146 (UMA-labeled)  
 - NVIDIA: 551.76 (GeForce Game Ready Driver)

Issue Description While using Firefox ESR (128.7.0esr and 140esr), the laptop’s built-in screen occasionally begins to flicker, and after prolonged usage—especially when browsing Facebook for tens of minutes—it gradually develops severe distortion, resembling water damage or ripple effects.

Key observations: - Screenshots appear completely normal, indicating the framebuffer is unaffected. - No external monitor has been tested yet; the issue is only observed on the built-in panel. - Rebooting temporarily resolves the issue, but it recurs unpredictably. - This issue never occurred on my older laptop (Acer V3-772G) using the same ESR versions.

Steps to Reproduce 1. Launch Firefox ESR (128.7.0esr or 140esr) 2. Browse Facebook continuously for tens of minutes 3. Screen begins to flicker, then gradually distorts 4. Take a screenshot → image is normal 5. Reboot → screen returns to normal

✅ Expected Behavior The screen should remain visually stable during browser usage, without flickering or distortion.

Actual Behavior The built-in screen flickers and eventually distorts, while screenshots remain unaffected. This suggests the issue may lie in the final stage of the display output pipeline, possibly involving the TCON (Timing Controller) reacting to GPU output or Firefox’s rendering behavior.

Additional Notes  

- Hardware acceleration was disabled in Firefox for testing — the issue still occurred (on older versions). - No similar behavior observed in Chrome or Edge. - BIOS screen appears normal, ruling out panel damage. - After upgrading to Firefox ESR 143.0.4 (64-bit), the distortion issue has not reappeared for two weeks, though minor flickering still occurs occasionally during browsing. - Interestingly, when distortion or flickering occurs while browsing Facebook, switching to another website immediately causes the screen to temporarily return to normal.

 This suggests the issue may be triggered by specific rendering patterns or GPU calls on certain web pages.

- This may indicate a rare interaction between Firefox ESR and specific hardware configurations (UMA → TCON → panel).

Guten Tag zusammen,

ich verwende Firefox 143.04. unter Windows und sortiere Lesezeichen in der Lesezeichen-Symbolleiste als Baumstruktur mit 1-2 Ebenen. Beim Anlegen eines neuen Lesezeichens aus einer geöffneten Seite via [Strg+D] wird es automatisch angelegt und in der Lesezeichenleiste gespeichert. Bis hier ist alles soweit okay, auch wenn ich mir hier einen kurzen Dialog gewünscht hätte.

Wenn dieses neue Lesezeichen per Maus (Drag and Drop) in die Ordnerstruktur eingefügt werden soll, klappt sich der Ordner im Baum auf, sobald man mit dem angefassten Lesezeichen in die Nähe kommt. Gut.

Aber: Wenn mit diesem "am Haken hängenden" Lesezeichen in der Ordnerstruktur nach rechts in die nächste Ebene navigiert wird (Ordner klappen nach rechts auf und zeigen die bereits darin befindlichen Lesezeichen), dann schließt sich diese Ansicht und man muss mit dem Lesezeichen am Haken nochmal von vorne / oben anfangen.

Das ist ultra nervig und die Sensibilität des Programms war früher nicht so filigran eingestellt.

Es gibt sicher auch einen workaround (Lesezeichen-Verwaltung separat öffnen), aber das ändert nichts an dem veränderten Verhalten und ich umständlich. Haben Sie evt. ähnliche Erfahrungen oder Berichte anderer Benutzer? Anbei im Screenshot dargestellt der Weg.

Idee / Wunsch: Können Sie die Empfindlichkeit beim Ziehen von Lesezeichen etwas "entschärfen" oder eine simplere Eingabemöglichkeit implementieren (z.B. jede Ebene durch eine Mausgeste fixieren, sodass die nicht "unter der Nase zugeht")?

Besten Dank vorab.

Für Fragen bin ich gerne offen. Beste Grüße!

After a recent update, my address bar behaviour change so much that it's making Firefox unusable for me.

The behaviour I want and what I used to have: - I start typing into address bar, I select the highlight (search or history result usually) - I press Cmd + Enter, the highlighted result opens in a new tab.

Now, what I get is: - The halfway typed text gets selected and turned into a url, for example if I want Reddit and I type "red", it opens https://www.red.com/ ?? - It does NOT open a new tab

I think now Option key behaves kind of similar to how Cmd key used to behave. I was on the 128 ESR release for a long time, so it might have change a while back.

How can I get back my Cmd key behaviour, to behave like Option now?

my firefox/mozilla updated without my knowledge. I turned the computer off and on and when it came back on it said it updated. My bookmark bar is missing along with all the drop down bookmarks I had..there was an arrow pointing down. I don't remember all of the bookmarks there were and there were lots. Some were for doctor portals. How can I get my bookmarks back I tried some online stuff but nothing works. Donna

I'm a developer of a web portal for a german energy supplier based on HCL Domino. The login which uses AJAX/XHR and Dojo worked for the last 8 years and until Firefox 142. But with FF 143 it's impossible to login to the user acount. I can't recognize any error in the dev tools, The request returns status 200.

Has anything changed from 142 to 143 concerning this handling?

Thanks in advance :-)

Thorsten

I use the Selenium IDE plugin for my job about 1 year. But yesterday I encountered a problem. I saved the project I was working on and left work on Friday(10.10.2025). And for a year, I kept saving it to my desktop. Yesterday(13.10.2025) morning I restarted my computer because it was running very slow. When I turned on the computer, I saw that the Selenium IDE project file I was working on was missing. I say "lost" because when I had it checked by the system team at the company I work for, it didn't appear to have been deleted. Also, I don't have any files with the ".side" extension in the recycle bin. I tried to find it with programs like Recuva and Everything, but it is not found. This is a very important file for me and my work. Can you help me please?

File name: MevaTest.side Selenium Ide extension version: 3.17.4

I recently got a new computer running W11. As always, the first thing I did was download Firefox and set it to my default browser. Then I logged in and synced. Firefox picked up some things - like my passwords, but not a single instance of history, not a single bookmark, or the tiles of frequent websites seen on the new tab page. Thinking something had gone wrong, I uninstalled FF and then reinstalled it. No change. As I was researching what to do when FF syncing fails, I realized that FF is not saving any data in history. NONE. I fiddled around with this situation for about five hours and it showed NO history of websites/pages visited. I went to a few common websites by name, typing www.ebay.com into the search bar (for example) and since that was a website I had now "frequented" I expected it to show up as a tile in the new tab page, but it didn't, even after closing it and opening it several more times to demonstrate (to FF) its frequent-ness.

What could be causing all this? I assume some settings in about:config are off, but can't find any information searching the web. No matter how I state the question, I only get responses like what to do if FF doesn't sync, NOT what to do if FF doesn't collect any history. Honestly, this is a standalone private home computer. It doesn't actually HAVE to sync with work. But it's not very useful to have a browser that collects NO history.

Sorry this is so long, and may I say, any help will be seriously appreciated.