I'm trying to find a way to show how long a particular tab has been open in Firefox. Alternatively, finding out when a tab was opened would work as I could calculate the open time myself. I'm willing to install extensions, etc. Instructions for other browsers would be appreciated as well, in case there's no way to do this in Firefox. This seems pretty simple, but I haven't been able to find anything after extensive searching. Help!
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
In Firefox, I found a slightly different solution. In the addon, Simple Timer, there's a timer that shows how long a browser session has been open. So I can use this to find out how long a particular browser window has been open. It's not quite as fine grained as per tab, but it works for my purposes and doesn't require me to calculate anything or start a timer.
I recommend the Firefox addon Load Time by Nobuyuki Honda
But as other people said above, checking the day of the History open tabs its the ideal solution!