Memory leak during Microsoft Teams calls

I’m using the latest stable Firefox package from the official Mozilla repository for Ubuntu, on a system with 32GB of RAM. I’m also using Microsoft Teams for work calls,… (read more)

I’m using the latest stable Firefox package from the official Mozilla repository for Ubuntu, on a system with 32GB of RAM.

I’m also using Microsoft Teams for work calls, in the browser (because Linux) and I notice that Ubuntu has killed the FF process twice last week because it was using too much memory - see attached image. I’ve only had 4 or 5 Teams calls last week so this isn’t a great success rate. It seems that after half an hour or so, FF has hogged so much memory that the OS feels the need to kill it.

If this is a known issue: are there any known workarounds?

If this is not a known issue :Can I help by providing troubleshooting data? How?

Thanks in advance!

Open

Cannot access local network ip addresses on Firefox Nightly for Android

Firefox Nightly for Android After one of recent update (few weeks ago) cannot access local network ip addresses. Tried different suggestions from SO in about:config but n… (read more)

Firefox Nightly for Android

After one of recent update (few weeks ago) cannot access local network ip addresses.

Tried different suggestions from SO in about:config but nothing helps.

Other browsers works.

Open 1

Twitter/X Login Impossible

Logging in to Twitter/X is no longer possible as of a couple of days ago. After entering the username, pressing the "Next" button does nothing. Using the Desktop or Mobil… (read more)

Logging in to Twitter/X is no longer possible as of a couple of days ago. After entering the username, pressing the "Next" button does nothing. Using the Desktop or Mobile version of the site makes no difference.

Open 12 40

Suddenly to download emails, Thunderbird sayw it can't find my "Inbox" folder. ??

I've been using TB for many years, and without warning, when it tries to down load my mail from the Proton mail server, it says it can't find the folder "Inbox". I've tri… (read more)

I've been using TB for many years, and without warning, when it tries to down load my mail from the Proton mail server, it says it can't find the folder "Inbox". I've tried to "repair" that folder a couple times unsuccessfully. I've restarted the TB program a couple times, but nothing changes. The error shows up on the bottom "instruction line". I've gone through all my settings and find nothing amiss. Not sure where to go from here. -- Just noticed that I had about 80 emails in that Inbox folder that are now missing completely. Normally, I move read emails to there respective folders, and leave important ones in the Inbox for followup. One significant note here, is I'm still using Win 7 premium. So far it hasn't been a problem. Thanks a bunch, Gerald

Open

Email search limited to 10 results. Can this be changed?

Sometimes a search term will pull up many emails I need to sift though, like in the case where it's a common word, like permit. I was searching the term "permit" for buil… (read more)

Sometimes a search term will pull up many emails I need to sift though, like in the case where it's a common word, like permit. I was searching the term "permit" for building permit emails and got many unrelated emails that were more recent with permit in the email body. I am able to quickly skim and see these are unrelated but the limiting factor is only ten results per page. When I click load more, takes a few moments to load. I was unable to find any way to change this. How can it be done? Should be possible, it's doesn't affect Mozilla's processing because everything is done locally on my machine. I would much rather 100 results to load or to load indefinitely.

Additional question: on that search term, many unrelated emails came up as mentioned before. When I searched the same term in gmail in my internet browser, only relevant emails came up. Why is this? How do I improve the thunderbird search?

Open 3

Thunderbird hangs my computer/machine periodically, rarely

Thunderbird causes my machine to 'hang' from time to time, 1. often for up to a second and usually a number of times in quick succession on each ocasion. Sometimes this … (read more)

Thunderbird causes my machine to 'hang' from time to time,

1. often for up to a second and usually a number of times in quick succession on each ocasion. Sometimes this happens frequently - say every 5 or 10 minutes - sometimes only after an hour or more since the past occurrance.

2. My machine hangs completely - nothing will work, mouse, keyboard, sound, other apps etc. If I happen to be typing (into any app - including Thunderbird - when this happens, input ceases, the cursor freezes and - if the problem persists for a second or two, Windows reports "[app] is not responding"

3. I cannot be certain, but I believe the problem occurs whilst messages are being retrieved.

This is a very serious problem as it means that I can never leave TB running as the problems it causes are not acceptable.

4. This means I cannot deal with incoming messages without periodically re-starting TB - which is an utter PIA.

I am running Win 11 Professional on a 2-year old machine with 64 Gb of memory. I have run TB in Troubleshoot mode, I have confirmed that the problem occurs regardless or whatever other apps are running (or none) and I have proven conclusively that no other app causes any kind of similar problem.

Looking forward yto hearing if others have had the same issue and what can be done about it.

Open 32 139

I am signed in to Mozilla account but the VPN plug in never gives me the option to turn it ON.

I am signed in to Mozilla account but the VPN plug in never gives me the option to turn it ON. I see the VPN plug in in the tool bar, every time I click on it, it tells m… (read more)

I am signed in to Mozilla account but the VPN plug in never gives me the option to turn it ON. I see the VPN plug in in the tool bar, every time I click on it, it tells me to sign in to my account even though I am already signed in. It never presents the option to turn "on" like I see in the FAQ. The "Turn on VPN" option never appears.

Open

Can't log into Google account, redirects to "clear cache and cookies"

I am having the problem a fix was created for previously where attempts to sign in to my google account continually redirect to a request to clear cache and cookies. Have… (read more)

I am having the problem a fix was created for previously where attempts to sign in to my google account continually redirect to a request to clear cache and cookies. Have done so multiple times, still can't log in. Can log in on Chrome so definitely a Firefox-specific issue.

We have resolved an issue with Google prompting users to ‘clear cookies and site data’ when logging in. A fix has been published, via Firefox remote settings that does not require a Firefox upgrade. Users will receive the update over the next 6hrs, if you would like to update immediately simply restart Firefox.

Note: The issue was related to CHIPS being enabled in Fx131, this feature has been temporarily disabled while we resolve the issues. Users who have disabled 'Allow Firefox to install and run studies' in Privacy & Security settings will need to enable to receive the update.

Open 2

Directv.com site logs me out immediately.

I am trying to edit my payment method with Directv.com. I log in with no issues. However, every time I try to access "edit payment" their website automatically logs me … (read more)

I am trying to edit my payment method with Directv.com. I log in with no issues. However, every time I try to access "edit payment" their website automatically logs me out. After a discussion with them, they blame Firefox for the problem and want me to use a different browser. Is it Firefox or is it their website?

I have attached a screen shot so you can see where if I click I get logged out.

Open 1

Under installed apps I have two entries for Thunderbird: 1) 140.8.0, 2/25/2026, 244 GB (sic) and 2) 140.12.1, 7/2/2026, 250 GB. Is it safe to temove 1), and how is it possible to be that large an app?

Please let me know if it is safe to remove the older version of Thunderbird in the Installed Apps list. I also question whether the size of the app in the list is accurat… (read more)

Please let me know if it is safe to remove the older version of Thunderbird in the Installed Apps list. I also question whether the size of the app in the list is accurate; 250 GB seems quite enormous in a 500 GB hard drive. Thanks, Hans

Open 1

Getting redirected to a VPN ad page when I start to download using a torrent

I download my share of media using BitTorrent with Pirate Bay. Just lately, every time I attempt to download something I get redirected to a page, https://ultimatesurfer… (read more)

I download my share of media using BitTorrent with Pirate Bay. Just lately, every time I attempt to download something I get redirected to a page, https://ultimatesurferprotector.com/lp5.php, that tries to sell me a VPN and I can find no way to stop this or contact them. I am happy with the VPN I have and have no interest in purchasing another. Does anyone know how I can prevent this from happening? Thank you.

MikeQ wdr5kt3ah@mozmail.com

Open

Hello, I’m seeing high CPU and memory use from the “FirefoxCP Isolated Web Content” process even when tabs are inactive

Hello there, I’m experiencing high memory and CPU usage in Firefox, which is affecting my computer’s performance. One issue appears to be that “FirefoxCP Isolated Web Con… (read more)

Hello there,

I’m experiencing high memory and CPU usage in Firefox, which is affecting my computer’s performance. One issue appears to be that “FirefoxCP Isolated Web Content” continues running even when tabs are inactive, contributing to increased resource usage.

Other browsers, such as Microsoft Edge, reduce memory and energy consumption by putting inactive tabs into sleep mode after a period of inactivity. I would prefer to continue using Firefox as my default browser, but I need a way to manage this level of resource usage.

Could you please advise whether Firefox offers a comparable setting, workaround, or planned improvement to reduce CPU and memory usage from inactive tabs?

Thanks for your help!

Open

decrease size of toolbar icons

I used to have many more icons on my toolbar. Since having to upgrade to Windows 11, the individual toolbar icons are huge! I can only get 6 on my toolbar, whereas on Wi… (read more)

I used to have many more icons on my toolbar. Since having to upgrade to Windows 11, the individual toolbar icons are huge! I can only get 6 on my toolbar, whereas on Windows 10 I have at least 11. Having to scroll down the bookmark list is time consuming and frustrating.

Suggestions?

Open