This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox insanley lagging in Ubuntu 21.04 LTS

more options

I use Firefox on Ubuntu 21.04 LTS and recently started facing delay of 3-4 seconds while trying to open any add-ons in top bar or even when trying to navigate application menu. I recently moved from windows to Ubuntu, no such lag or delay was there in windows.

What I tried- I tried to troubleshoot this problem with the help of troubleshooter present in Firefox and used the 'Refresh Firefox' option but still it was lagging too much. I also tried to remove all add-ons but still it was of no use. My system is fast enough to handle Firefox.

I use Firefox on Ubuntu 21.04 LTS and recently started facing delay of 3-4 seconds while trying to open any add-ons in top bar or even when trying to navigate application menu. I recently moved from windows to Ubuntu, no such lag or delay was there in windows. What I tried- I tried to troubleshoot this problem with the help of troubleshooter present in Firefox and used the 'Refresh Firefox' option but still it was lagging too much. I also tried to remove all add-ons but still it was of no use. My system is fast enough to handle Firefox.

All Replies (2)

more options

Can you show what is running when you open Firefox? I had a similar issue last year with Firefox performance and it turned out to be a bug.

https://bugzilla.opensuse.org/show_bug.cgi?id=1176852

Can you try Firefox in a different user profile to see if you have the same issue? How about downloading a separate copy to a folder and run it from there to see if you have the same issue.

https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

more options

I did everything, fresh installation and everything possible, at the end I had to create a bug at https://bugzilla.mozilla.org/show_bug.cgi?id=1709763 you can see all the details over there. Also I have the same Firefox configuration in windows and it doesn't lag over there.