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Cannot install add-ons because of connection error

No add-ons coming from https://addons.mozilla.org/en-US/firefox/ can be installed in my Mac, all because of a single issue ("Download failed. Please check your connection… (tuilleadh eolais)

No add-ons coming from https://addons.mozilla.org/en-US/firefox/ can be installed in my Mac, all because of a single issue ("Download failed. Please check your connection."). I've noticed that images in this site cannot load properly as well. I checked the console and it seems that the GET request was responded with 404. Install requests sent to other websites seem to be working. I successfully installed zotero from its website and some other add-ons via downloaded .xpi files. However, some .xpi's cannot be installed directly either. I got a message saying this add-on appears to be corrupt.

I duckduckwent this issue and tried all the following solutions (though none has helped): 1. Added "xpinstall.enabled => true" and "xpinstall.signatures.required => false" in about:config; 2. Downloaded the .xpi file directly using other browsers, but when I tried to add it manually, I got the message saying this add-on is corrupt. 3. I tried InstallTrigger.install({URL: "https://addons.mozilla.org/firefox/downloads/file/1168281/adblock_plus-3.4.2-an+fx.xpi?src=search"}) in the console and still got the connection error. I clicked on several install links in add-ons websites and they came back with 404. I think these links were redirecting me to addons.mozilla.org.

I don't have any antivirus software in my Mac, at least not that I know of. I enabled "allow site to install add-ons" and "allow pop-ups", etc.

Asked by yc_cxy 1 bhliain ó shin

Answered by jscher2000 1 bhliain ó shin