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I have lost my tabs after the recent update. They used to show all tab groups in toolbar icon as mentioned here (https://support.mozilla.org/en-US/kb/tab-groups) in manage tabs section. Only the groups that were open are retained, the groups which were closed are lost. They contained important tabs which I haven't bookmarked. I didn't see any policy of removal of inactive tab groups after certain time, any help would be really appreciated. I use the desktop app on Linux.

With Firefox 144, there is unasked for/unwanted AI introduced. How do I ensure that all AI is completely disabled in my browser? I found a link describing some settings, but want to confirm this will disable ALL AI in the browser. I don't want it, don't trust the privacy/security holes yet to be found and would prefer it was not included in Firefox to begin with. The list I've found is:

• user_pref("browser.ml.chat.enabled", false);
• user_pref("browser.ml.chat.menu", false);
• user_pref("browser.ml.chat.page", false);
• user_pref("browser.ml.chat.shortcuts", false);
• user_pref("browser.ml.chat.sidebar", false);
• user_pref("browser.ml.enable", false);
• user_pref("browser.ml.linkPreview.enabled", false);
• user_pref("browser.ml.linkPreview.optin", false);
• user_pref("browser.ml.modelHubRootUrl", "");

Will this do it? What about:

browser.ml.chat.nimbus

Do I need to clear that field to ensure I don't get some auto opt-in in the future as more and more of this "stuff" is put into the browser?

Why not leave Firefox as a security/privacy conscious browser and put out a separate AI browser (FirefoxML?) for those that are not as concerned. How does Mozilla ensure that no information is leaked through AI from sessions for professionals that must protect physician/patient, attorney/client information or other legally confidential information?

For some reason my install of FireFox on Linux refuses to hide the picture-in-picture button in the address bar on video sites.

See included images; all relevant settings are disabled.

Since the update to 142, on pretty much every site it keeps jumping back to the top of the page. Happens on a lot of sites. For some reason, if I select some text at the top of the page it seems to stop this. A lot of people may not have discovered this. Mozilla just needs to fix it. I am using Ubuntu 24.04. Been using Firefox for many years. Never seen this before.

Trouble with streaming services(like youtube(only streams ), twitch, music streaming) on nightly Firefox Nightly 145.0a1 (2025-10-11) (x64) Cachy OS Binary from firefox.com

I updated firefox through apt, and since then, have not been able to log into twitch I am on ubuntu 24

apt list --installed | grep firefox firefox/mozilla,now 144.0.2~build1 amd64 [installed]

Attempting to log in returns the generic "Your browser is not currently supported"

For a couple of days now Instagram linked videos won't play here. Actually some of them will -- my own reels and anything linked with that button that looks like a movie 'clapper'. But videos that show the triangular arrow pointing to the right, nothing happens when you click. Not sure if this is a FF issue or maybe something changed at Instagram. Did a google search and nothing came up.

Yesterday Thunderbird upgraded itself to a version which will no longer run Lightning. For me, this is a crisis as I need access to my calendar. Please don't suggest I get a working copy of Lightning and install it, as apparently no such thing exists.

How do I roll-back to the previous working version? I am running Ubuntu 16.04. I have no idea what the last working version of Thunderbird was but my current (broken) version is 60.2.1.

Thank you for any suggestions.

I'm running Thunderbird 52.8.0 on Ubuntu 18.04 LTS, and I can not find where to change the settings for how quickly an email is marked as read. All of the other posts on this subject seem to be talking about Windows rather than Linux, and the setup is clearly quite different, ie in Thunderbird for Windows, it's Tools > Options > Display > Advanced; in Thunderbird for Linux, I presume it's somewhere under Edit > Preferences, but I can't find it anywhere. Can anybody please help?

Hello,

After upgrading my Thunderbird install to version 60.2.1 on my Xubuntu 18.04 machine, I cannot access my mail anymore, because there seems to be a problem with passwords.

Symptoms:

- When starting Thunderbird, I get an "Enter your password" box for each of my accounts even though I had my passwords saved.

- When I go to Preferences -> Security -> Passwords -> Saved Passwords, the list is empty.

- When I try to enter a password and save it, it does not actually get saved and Thunderbird will ask again soon after.

- The following line is logged to console a whole bunch of times:

JavaScript error: jar:file:///usr/lib/thunderbird/omni.ja!/components/crypto-SDR.js, line 179: NS_ERROR_FAILURE: Couldn't decrypt string

Other findings:

- Downgrading Thunderbird to 52.7.0 fixes the problem. The old saved passwords just reappear again and Thunderbird has no problem logging in.

- Starting Thunderbird 60.2.1 on a Windows 10 box with exactly the same profile folder works fine. It can read the passwords and access my mail accounts.

Can you please tell me what to do to fix this, so I don't need to keep using an old version of Thunderbird just to access my mail?

Thanks,

Hi all,

I use LinuMint 17.3 Cinnamon 2.8.8 (64-bit) with 3.19.0-32-generic kernel.

Yesterday I upgraded my version of Thunderbird to the 60.2.1 (64-bit). It came automatically with LinuxMint update manager, which I usually trust, so did yesterday. Unfortunately I find out that Lighting extension, with all my calendar data, just disappeared. I followed the suggestions here (https://support.mozilla.org/en-US/kb/calendar-updates-issues-thunderbird) but I turned out that is not possible to restore Lighting in my case. If I try to re-install it, it simply says the current Lighting version is not available for the latest Thunderbird one.

I backed up all my profile data and .thunderbird folder, so I hope to be able to find a way to fix this somewhere in the future.

I tried to downgrade Thunderbird, but it seems not possible to me to download a previous version from this website, neither I find it on my MintInstall manager. Any suggestion for this would be of great help. Also, if there is a Lighting version coming up anytime soon I'd be relieved of knowing that.

In the meanwhile, I would also appreciate if you can tell me a way to at least read my calendar from the .sqlite files in claendar-data folder. Maybe there's an alternative software I can use for this purpose? I tried also SeaMonkey, but it seems incompatible with a lot of stuff on my computer and it simply does not run when launched).

I am kind of desperate. Any suggestion is a big help. Alf

I would like the Auto Read option to be delayed even when using the reading pane. The forum talk about that option being available in thunderbird under Tools>options> Advanced. I have however looked at all option including Edit>Preferences & do not find such option in the version of software mentioned above. r

I have tried this on several versions of Ubuntu and on several versions of Mac OS X and the problem is the same. It appears that this is a bug that was previously fixed and that has reappeared.

Thunderbird updated to 60.2.1 and Lightning disappeared. I followed the guidance in https://support.mozilla.org/en-US/kb/calendar-updates-issues-thunderbird, and got Lightning back (V6.2.2.1). However, in Get Add-ons, it is still grayed out and listed as "incompatible with your version of Thunderbird", which is a bit disconcerting. My life is in my calendar, and I can't afford compatibility issues.

Is this just a matter of the add-ons library not having the most up-to-date version (or a bad compatibility checker), but what was somehow magically reloaded into my Thunderbird is completely fine? Or is the latest version that has been reloaded actually still incompatible in some way, and I'm waiting for the other shoe to fall with problems that will turn up later?