FireFox "Software installation has been disabled by your system administrator"
Installing Firebug in FireFox I get this error message:
Software installation has been disabled by your system administrator
I am a administrator of this PC, how do I allow installation of Firefox addons?
Note: answering my own problem to help others in the future.
The root cause is this setting:
This blog posted 3 years ago has a solution with Windows XP, the trick back then was to change this setting:
user_pref("xpinstall.enabled", true); in the file C:\Documents and Settings\UID\Application Data\Mozilla\Firefox\Profiles\fxlme5ka.default.
To do this on a recent version of Firefox, follow these steps:
Close Firefox
Open the C:\Program Files (x86)\Mozilla\Firefox\mozilla.cfg file in Notepad
Comment out the rule that is blocking it:
// Block extensions
//lockPref("xpinstall.enabled", false); // prevent extensions
- Restart Firefox
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