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While on all sites, after 5 minutes Firefox closes site and goes to opening page. Why?

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While on all sites, after 5 minutes Firefox closes site (tab) and goes to opening page. Any idea Why?

While on all sites, after 5 minutes Firefox closes site (tab) and goes to opening page. Any idea Why?

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Does that also happen in Troubleshoot mode (https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode)? If not, go back to normal mode > disable all your add-ons > re-enable one at a time and test.

If you have a lot of add-ons, disable half of them. If the problem still exists, re-enable them, disable the other half, and narrow it down in a similar fashion.

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