Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

Laggy Firefox

  • 8 replies
  • 1 has this problem
  • 27 views
  • Last reply by cor-el

more options

I am facing two issues with Firefox. I am using Firefox on Macbook Pro 2017 with i7 processor and 16GB Ram, but after importing all my bookmarks from chrome its laggy like when i move mouse hover the bookmarks its animation response time is slow ie :- Moving cursor up and down the blue animation strip its bit delay comparatively mouse cursor movement.

Secondly i am having issue with YouTube, when i am double click on YouTube video to full-screen its give blank screen for a sec its bit annoying i think it need to fix.

I am facing two issues with Firefox. I am using Firefox on Macbook Pro 2017 with i7 processor and 16GB Ram, but after importing all my bookmarks from chrome its laggy like when i move mouse hover the bookmarks its animation response time is slow ie :- Moving cursor up and down the blue animation strip its bit delay comparatively mouse cursor movement. Secondly i am having issue with YouTube, when i am double click on YouTube video to full-screen its give blank screen for a sec its bit annoying i think it need to fix.

Modified by Roland Tanglao

Chosen solution

The issues you describe can be caused by a problem with the places.sqlite and favicons.sqlite databases in the Firefox profile folder.

  • use "Verify Integrity" button on the "Help -> Troubleshooting Information" (about:support) page

If errors are reported with "Verify Integrity", close and restart Firefox and retry.

If "Verify Integrity" cannot repair places.sqlite, rename/remove all places.sqlite and favicons.sqlite files in the Firefox profile folder. Firefox will rebuild places.sqlite and restore the bookmarks from a recent JSON backup in the bookmarkbackups folder.

  • keep a backup copy of places.sqlite in case a new places.sqlite database has to be created

See also:

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

Read this answer in context 👍 0

All Replies (8)

more options

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?


https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

https://support.mozilla.org/en-US/kb/firefox-takes-long-time-start-up

https://support.mozilla.org/en-US/kb/quick-fixes-if-your-firefox-slows-down

more options

Hey FredMcD i already did this drill but problem is same i think its some firefox bug if you import more bookmarks its start lagging and animation is slow.. its annoying that was the only reason i switch to other browser like brave or chrome. even thu Microsoft edge is also good these days.

more options

Make sure all software is up to date.

more options

Yes everything is upto date

more options

HI Iqubal Singh

When you wrote "Hey FredMcD i already did this drill" does that mean you tried Firefox Safe Mode as Fred suggested?

Cheers!

...Roland

more options

@Roland Tanglao yes i mean i tried everything with safe mode as Fred Suggested.

more options

Hi Iqubal Singh

Please goto:

about:support

and copy and paste what's in the clipboard after clicking:

"Copy text to clipboard"

Cheers!

...Roland

more options

Chosen Solution

The issues you describe can be caused by a problem with the places.sqlite and favicons.sqlite databases in the Firefox profile folder.

  • use "Verify Integrity" button on the "Help -> Troubleshooting Information" (about:support) page

If errors are reported with "Verify Integrity", close and restart Firefox and retry.

If "Verify Integrity" cannot repair places.sqlite, rename/remove all places.sqlite and favicons.sqlite files in the Firefox profile folder. Firefox will rebuild places.sqlite and restore the bookmarks from a recent JSON backup in the bookmarkbackups folder.

  • keep a backup copy of places.sqlite in case a new places.sqlite database has to be created

See also:

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.