Some Firefox extensions require access to local storage and/or indexedDB, for instance to store data on the user device Firefox runs on. These extensions may break if cookies are blocked. Extensions like uBlock Origin, uMatrix, or Stylus use the storage and thus require cookie permissions even if they don't set cookies to work correctly. While some come with fallbacks built-in to overcome this lim
![How to deal with Firefox extensions that require cookies - gHacks Tech News](https://cdn-ak-scissors.b.st-hatena.com/image/square/01c64a92e496904a0504ae0f7ef83ee90e9375a1/height=288;version=1;width=512/https%3A%2F%2Fwww.ghacks.net%2Fwp-content%2Fuploads%2F2017%2F10%2Ffirefox-extensions-cookies.png)