FIX tab counter numbers are wrong

[allanlaal]

use case:

open up a new chrome window for a website with some links
open 10 links from that site
detach the original tab and close the window with the other tabs you just opened

expected result:

tab counter decrements by 10

actual result:

tab counter decrements by 1, sometimes 0

notes:

this is a random use case, I'm sure there are many. I've been using this parallel with "Tab Count" and "Chrome Tab Counter" for months with hundreds of tabs open at a time and probably thousands of tabs opened during the uptime of Chrome (I have to kill it weekly as it memfloods like crazy). Only "Tab Count" reports the correct open tabs number (currently showing 149), both this ("Tab Counter") and "Chrome Tab Counter" drift off (currently both showing 975)