Firefox doesn't properly save open tabs in SessionStorage
For a few weeks some of my tabs aren't properly restored. Instead of being on the page I last browsed, the displayed page is some page I previously accessed (e.g. it shows google.com instead of the google result page or it shows the about:newtab page instead of some other page I accessed after that). This affects "Undo Close Tab" as well as restoring a session, a feature I always use. I have this problem on all of my computers which all have different profiles and operating systems. I even made a completely new profile and could observe the issue there. Looking into the profile folder's sessionstore.js or recovery.js I can see that tabs that have this issue simply are missing the entries I browsed. For me it looks like this is happening randomly.
Chosen solution
I found a bug report describing my issue, so it seems to be a bug in Firefox. https://bugzilla.mozilla.org/show_bug.cgi?id=1230769
The bug is caused by disallowing cookies. (Preferences > Privacy > Select Firefox will "Use custom settings for history" > Uncheck "Accept cookies from sites")
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You may have corrupt sessionstore file(s).
Type about:support in the address bar and press enter.
Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.
Locate the sessionstore file(s). Then rename or delete them. Restart Firefox.
I've deleted all folders and files that have session in their name but unfortunately it still happens.
Chosen Solution
I found a bug report describing my issue, so it seems to be a bug in Firefox. https://bugzilla.mozilla.org/show_bug.cgi?id=1230769
The bug is caused by disallowing cookies. (Preferences > Privacy > Select Firefox will "Use custom settings for history" > Uncheck "Accept cookies from sites")
Modified by Xu158
That was very good work. Well Done.