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Stuborn startup session

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For several weeks now, Firefox keeps starting up with same set of tabs despite I configured it (via Tab Mix Plus extension) to select last quit's set. I have re-configured many times, reinstalled Firefox and performed refreshment and nothing works. Once, it worked for a couple of starts, but eventually same set of taps came back

For several weeks now, Firefox keeps starting up with same set of tabs despite I configured it (via Tab Mix Plus extension) to select last quit's set. I have re-configured many times, reinstalled Firefox and performed refreshment and nothing works. Once, it worked for a couple of starts, but eventually same set of taps came back
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You can check for problems with the sessionstore.js file in the profile folder that stores session data. When sessionstore.js 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 use this button to go to the current Firefox profile folder: