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How to fix broken browser session

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Manuel Reimer edited this page Dec 30, 2019 · 4 revisions

It sometimes happens that Undo Close Tab just stops working completely. The reason for this is that there is a bug in Firefox which can cause your browser session to become corrupted in a way which does not cause any problems with Firefox itself but breaks the Firefox sessions API.

To revive Undo Close Tab (and other Addons which rely on the sessions API), you can follow the following steps:

Warning in advance: This will reset your browser session. This means that Firefox starts up without any tab open. So be sure to bookmark all tabs you want to keep!

  1. Open the Firefox preferences. For example by just entering "about:preferences" into the URL bar
  2. The preferences page should start with the "General" category already opened. If not, open it.
  3. Uncheck the checkbox "Restore previous session". It should be the first checkbox from top.
  4. Restart Firefox

Undo Close Tab should be revived now. Feel free to go to your preferences again and recheck the checkbox you just disabled to get your newly created session restored on browser restart (for as long as it takes to get broken again).

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