Piggybacking on #3, it would be great to be able to exclude pinned tabs from the count. Pinned tabs are sth like an app, they are always there, out of the way, ready to jump back into them when I need e.g. to check my gmail. The rest of the tabs (non-hidden, non-pinned) are transient tabs for carrying out the current task in mind.

I am using the Simple Tab Groups addon, which hides tabs to support tab groups. It would be very helpful to have the tab count be per group, i.e. show only the visible counts each time.

1.Think completely and work and that thinking should be done at once,as little thinking causes mistakes.

2.If u add a new feature or update an existing feature think of all the ways of how it can be improved

3.Increase patience

4.Avoid laziness in work

5.Do important work first

6.If u can't repro a bug normally then test it thoroughly and try to repro for 2 to 3 times.

It would be useful to have an option to see both per window and global count at the same time.
I think both counters could fit perfectly in the icon, by making the text smaller, and in two rows, e.g.

14/
23

So we can get the full picture at a glance.

Not seeing the tab count anywhere except on the FF Extensions list after scrolling down to Tab Count Icon.