https://discourse.mozilla.org/t/chinese-users-cant-use-ad-blocker-extensions/94823
Previously, ad blocker extensions were inaccessible for Chinese users due to Mozilla’s Chinese partner was under law suits and the court ordered it to stop providing such extensions. But now with Firefox announced shutting down of its operations in China, I think these extensions can be made available again. I sincerely hope you can consider it, thanks.