the brook

Since the new version of GMail has rolled out, the GMailManager extension for Firefox has stopped working. I found a hack on the mozilla forum by PMDv1 which I’ve tested and it works.

find your profile folder
browse to the extensions directory
open the folder named {582195F5-92E7-40a0-A127-DB71295901D7}
open the components folder
Open “gmServiceGmail.js” in your favorite text editor (notepad)
Use the find feature to the following text: “?search=inbox&view=tl&start=0&init=1” (without the quotes)
Append “&ui=1” to that text (again, without the quotes)
Save the file, and then restart Firefox! It should now show your unread messages!