Remove "Tabs" permission for Firefox < 86
On 2021-10-05 the last update of Firefox ESR 78.x was released. All ESR users will be updated to Firefox ESR 91.x on 2021-11-02. This version no longer requires the Tabs permission (#612)
This means that LocalCDN will only work up from Firefox 86 (Released on 2021-02-23)
Deleting a branch is permanent. It CANNOT be undone. Continue?