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Re:WebIDE lands in Firefox Nightly by Excavator on Monday June 23, 2014 @02:34PM (#7933588)
You can use Profiles¹ for that sort of stuff. about:config² is good for a somewhat complete list of components that can be enabled/disabled.

1: https://support.mozilla.org/en-US/kb/profile-manager-create-...

2: about:config?filter=.enabled

Re:WebIDE lands in Firefox Nightly by canuckistani on Monday June 23, 2014 @04:52PM (#7934590)