Rated 4 out of 5 stars

@m1ndh4ck: How about turning off the automatic login on startup in the general options tab?

@chococat: I moved my GManager account icons to the addon bar (accounts>modify>toolbar>display placement) and now they're always displayed at the end of the navigation bar.

@Ruca22: Options>Toolbar - switch off "Automatically switch to account with new messages".

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As for the addon itself, ever since the FF29 update, the account logins tend to lag every now and then... Sometimes they don't want to login at all.