Is there a way to find out how long a tab has been open, or when a tab opened?
- Show All History
- Show Columns
- Most Recent Visit
Works on all open tabs and tabs that have been closed, as long as you don't clear history often.
See my answer here. Basically, use this bookmarklet:
Or more specifically, as a duration (using a combination of answers from this question):
Type the 'j' and paste the rest into the address bar, as browser security measures automatically remove the