A cross-browser extension to suspend inactive / unused tabs by "hiding" them behind a static, generic browser error page. Basically to suspend https://www.microsoft.com, it will be redirected to http://localhost:0/#https://www.microsoft.com (try it ;) ). If you want to install the extension from source code (to ensure no possible abuse) - follow the instructions in the Github repo: https://github.com/VehpuS/simple-cross-browser-suspender.