FF opens 2 instances of FF

When I open now FF page I was expecting to see open c/o all the tabs, then 2 seconds later opens another page on top of the one with just a tab.
Any help would be appreciated

It is possible that there is a problem with the sessionstore.js and sessionstore.bak files in the Firefox profile folder.

Delete the sessionstore.js file [2] and files possible sessionstore-# .js [3] with a number and sessionstore.bak in the Firefox profile folder.

Delete sessionstore.js will cause App Tabs and tab groups and opened and closed the tabs (back) to get lost, so you will need to create them again (take note or bookmarks).

See also:

Tags: Firefox

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