Ad Block Plus will not install. "Firefox could not install the file." What can I do?
Error message is Firefox could not install the file at
https://addons.mozilla.org/firefox/downloads/latest/1865/addon-1865-latest.xpi?src=addondetail
because: Unexpected installation error Review the Error Console log for more details. -203
Wšě wotmołwy (1)
This link should help - https://support.mozilla.com/kb/Unexpected+installation+error+-203+when+installing+add-ons