Since tonight's update FireFox only works maximized or minimized, can not be resized
When started, Firefox opens a tiny window in the top left corner for two seconds, then minimizes. It can be maximized, but not resized. Double-clicking the top bar, which used to enable resizing, now minimizes it to the task bar. How can I get it to resize to half screen again?
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This can be a problem with the file localstore.rdf in the Profile Folder.
Delete localstore.rdf or rename the file to localstore.rdf.sav in the Profile Folder to test if the file is corrupted.
See http://kb.mozillazine.org/Corrupt_localstore.rdf
(caution: do not delete the localstore.rdf file in the Firefox program installation folder)
Note:
Deleting the file localstore.rdf will reset the customizations of the toolbars to the defaults.
You can rename "localstore.rdf" to "localstore.rdf.sav" to test if that solves it.
Then you can restore the customization by copying "localstore.rdf.sav" to "localstore.rdf" if it didn't work.
This worked for me:
1) start Firefox 2) minimize it 3) start a second copy. For me, this appeared as a small but visible copy in upper left of display. 4) drag/expand that second copy to a reasonable size 5) from the start bar, right-click on the first copy, and maximize it. 6) close the first copy ("X") 7) close the second copy. 8) Restart Firefox