PUBLIC MARKS from decembre with tag quantum

The hidden Firefox preference :privacy.resistFingerprinting.block_mozAddonManager removes the WebExtensions restriction. Here is how you set it: 1 - Load about:config in the Firefox web browser. You can run a search for privacy.resistFingerprinting.block_mozAddonManager just to make sure it does not exist. It does not in the most recent Firefox Nightly builds at the time of writing. 2 - Right-click in the part of the window that lists the preferences, and select New > Boolean from the context menu. 3 - Name the new Boolean value privacy.resistFingerprinting.block_mozAddonManager. Set its value to true. A value of true means that WebExtensions work normally on Mozilla's website. You can undo the change at any time by setting the preference to false on the about:config page of the browser. Mozilla added the new hidden preference to Firefox 57. It is not available in Firefox 56, and there is no option to introduce it in the browser. Firefox Stable users who run WebExtensions right now need to wait until the browser is updated to version 57 to set the preference and gain the functionality

How to enable Firefox WebExtensions on Mozilla websites (in https://www.ghacks.net/2017/10/27/how-to-enable-firefox-webextensions-on-mozilla-websites/): - Load about:config in the Firefox web browser. - You can run a search for just to make sure it does not exist: privacy.resistFingerprinting.block_mozAddonManager. It does not in the most recent Firefox Nightly builds at the time of writing. - Right-click in the part of the window that lists the preferences, and select New > Boolean from the context menu. - Name the new Boolean value: privacy.resistFingerprinting.block_mozAddonManager. - Set its value to true.