Needed this add-on to keep a page awake and avoid a very long login procedure.
Does the job well. Lightweight, open source and no fancy gimmick.
And most importantly, the add-on doesn't ask for useless permission to read your browser activity or data of all your websites.
For this, it's well deserved 5 stars.

have to write a review before i using it , but it looks good

I really liked, works pretty well.