I do not think that this is possible inside webextension. But you can do it yourself. If you use Firefox <57 just copy url from URLbar and paste on about:preferences page as home page. If you use 57: 1. Open about:debugging page and copy UUID of "Bookmarked Speed Dial" 2. Open about:preferences page and paste as home page moz-extension://your-UUID/data/index.html
