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Hello,
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Check for the presence of a mozilla.cfg file in the Firefox program folder to initialize some prefs.
This also involves the presence of a .js (JScript) file, probably in "defaults\pref" folder, that specifies to process this mozilla.cfg file.
If you have .js files apart from the channel-prefs.js file, that sets app.update.channel, in the defaults\pref folder then open this file in an editor like Notepad and please post its content. Also please post the content of the mozilla.cfg file.
There shouldn't be a mozilla.fcg file present unless you've created it yourself to initialize some prefs.
If you have this mozilla.cfg file then best is to do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.