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I run a lot of extensions, and I happened to notice that none seemed to work with Mozilla Addons.
I checked each extension, and some specifically whitelisted this site, but I changed that.
I also checked with about:preferences, and removed the value of extensions.webextensions.restrictedDomains. This seemed to have an effect on some sites mentioned by this string, like Firefox Accounts. But the Mozilla addons site seems to be unaffected.

My questions are:
Are there other whitelists I have missed that disable extensions from running?

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Note that browser extensions are prohibited from running on certain pages to protect the user's security and privacy. Bypassing this restriction will be done at your own risk.

Workaround #1: From this page on gorhill's uMatrix wiki, empty out the value of extensions.webextensions.restrictedDomains and set privacy.resistFingerprinting.block_mozAddonManager to true. Restart the browser if necessary.

Workaround #2. From bug 1445663, navigate to https://addons.mozilla.org. (with the trailing dot) to allow extensions to run on AMO.

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    I did not have the privacy.resistFingerprinting.block_mozAddonManager entry in my about:config, but adding it worked. Workaround #2 worked as well.
    – Havatra
    Sep 2, 2018 at 20:10

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