Firefox 138 Bookmarks not opened after 1st instance

[CMBJR]

Firefox 138.0.1 on Windows 10.

The FF Setting > General > Browser Layout > Show Sidebar is not checked.
I always have Bookmarks visible with Menu: View > Sidebar > Bookmarks

Since FF138 the first instance of FF will show the Bookmarks Sidebar. Subsequent instances of FF138 will not display the Bookmarks Sidebar by default and I must use the menu or the button on my toolbar to turn it on. I would really like this to work like it did before FF138 and have the Bookmarks sidebar visible in all instances started.

THX!

[siffemcon]

I can't repro it. There was a bug fix for it that landed in v138, so you could report it as another possible [bug](https://bugzilla.mozilla.org/enter_bug.cgi/).

[chokito · Accepted solution]

For me, it was enough to delete the "xulstore.json" file. After that, everything worked as before.
%appdata%/Mozilla/Firefox/Profiles

[CMBJR]

This worked for me too! Thank you!!
It would resolve in Safe Mode, but persisted with all of my extensions disabled.