This add-on has three versions:
- (Deprecated) Firefox version for Firefox 56 and below: Install on AMO. The code is in the
masterbranch. - Firefox version for Firefox 57 and above: [Install on AMO] (https://addons.mozilla.org/zh-TW/firefox/addon/focusblocker-new/). Check the
firefox-webextbranch - Chrome: Install on Chrome store. Check the
chromebranch