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Lag when opening a new tab

  • 7 replies
  • 1 has this problem
  • 1 view
  • Last reply by boxoframen

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Recently whenever I try to load a new tab while I am on another tab the browser will lag for a few seconds. This started happening last few weeks.

Recently whenever I try to load a new tab while I am on another tab the browser will lag for a few seconds. This started happening last few weeks.

All Replies (7)

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What are the sites when you do that so others can test if that is happening or not.

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hi, would you be able to capture and share a performance profile while this problem is happening?: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem

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Here is my performance profile for when this happens https://perfht.ml/2m9E9aM. I noticed it happens more often when I am trying to open youtube but it happens with other websites sometimes also.

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You can check for problems with the sessionstore.jsonlz4 file in the Firefox profile folder that stores session data.

  • delete sessionstore.jsonlz4 and sessionstore.js

When sessionstore.jsonlz4 is deleted you lose pinned tabs and open tabs and you will have to recreate them, so if necessary make a note or bookmark them.

You can check for problems with the places.sqlite database (bookmarks and history) in the Firefox profile folder.

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

If "Verify Integrity" on the "Help -> Troubleshooting Information" (about:support) page cannot repair places.sqlite then remove all places.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.

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.

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I deleted sessionstore.jsonlz4 and verified integrity without deleting places.sqlite. So far it looks like it has worked. Thanks for your help.

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thanks for providing a performance profile. do you have any recently submitted crash reports (starting with bp-) listed when you type "about:crashes" into the address bar? if yes, could you please post the handful of their most recent ids as well?

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I have one submitted crash report, all the others are unsubmitted. https://crash-stats.mozilla.com/report/index/bp-590affc9-a943-4ab9-b039-52b311180510