https://addons.mozilla.org/firefox/downloads/file/110435/firebug-1.6.2-fx.xpi?src=api because: Unexpected installation error Review the Error Console log for more details. -203
Unexpected installation error Review the Error Console log for more details. -203
Unexpected installation error
Review the Error Console log for more details.
-203
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See this link for details on resolving this - https://support.mozilla.com/kb/Unexpected+installation+error+-203+when+installing+add-ons