Warn before closing the tab - tag certain tabs

[prabhumns]

I want to specifically, tag certain tabs such that while closing the tab I get a warning.

[Jon]

Thanks for submitting an idea to the Mozilla Connect community! Your idea is now open to votes (aka kudos) and comments.

[majesticmini471]

Do you mean selecting pinned tabs, also?

[prabhumns]

Yes. Pinned tabs is doing this job but pinned tabs is doing some part of this but not the whole part it.
Lets say, I have a video playing in a mini window and also bunch other tabs open. I have closed the tab that powers the video playing window soo many time while closing rest of the tabs. But not just that, lets say I have an important tab open, when I am quitting (macos command + q) firefox, I want to see a warning.