After installing new Add-on,Firefox want me to restart to complete add-on installing,but when I restart firefox,add-on dissapears from Add-ons manager and won't install

After installing add-on,when Firefox ask me to restart to complete installation,in extensions folder it creates staged folder,but when i restart,this folder will removed and add-on not installed.
The Problem first happened when some extensions would not uninstalled and Firefox keep saying that addon will be uninstalled after restart,but nothing happen after restart.
So with following this instruction:
http://support.mozilla.com/en-US/kb/Cannot%20uninstall%20an%20add-on
After safe mode not worked either,I uninstalled extension with their IDs manually.After that I cannot install any add-on that needs restart.

This can be caused if one of the files that stores details of installed extensions is corrupt.
# Open your profile folder, for details of how to find it see https://support.mozilla.com/kb/Profiles
# Close Firefox
# Delete the following files if they exist, extensions.cache, extensions.rdf, extensions.ini and extensions.sqlite
# Re-start Firefox, it will then rebuild the list on installed extensions

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Steve

Does not work in Norway!
Med vennlig hilsen
Sincerely Yours,
Knut E. Fagerholm
[email protected]
+47 928 86 407
Sendt from my iPad.
Den 1. juli 2014 kl. 19:40 skrev dkbrillhart <[email protected]>:
Latest Revel IOS update crashes and won't install
created by dkbrillhart in Revel - View the full discussion
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After installing new Add-on,Firefox want me to restart to complete add-on installing,but when I restart firefox,add-on dissapears from Add-ons manager and won't install

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