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newer extension nipping at your toes -- but activeinbox is greyware Rated 5 out of 5 stars
RTM makes gmail seem a little less evil
ActiveInbox, firefox extension greyware (upselling), https://addons.mozilla.org/en-US/firefox/addon/3209/ , is nipping at RTM toes.. beware but be not afraid
competition is good for the f/OSS free market ;) But upselling greyware will die in the the light of mozilla community