Version Number in Add-ons Manager 的图标

Version Number in Add-ons Manager 1.10

作者: magicp

[Restartless] [e10s Compatible]
Easily viewable version info in the Add-ons Manager on Firefox/Thunderbird 41.0 - 56.*
Also restores the add-on version number on Firefox/Thunderbird 41.0 - 56.*.