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Ad Block Plus will not install. "Firefox could not install the file." What can I do?

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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

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Support Forum Moderator

Re: Ad Block Plus will not install. "Firefox could not install the file." What can I do?