I used the chrome extension WiseStamp
for a while, and have toyed with paying for it- I've come really close a couple of times- just for support purposes, not because I needed any of the 'advanced' features. WiseStamp is basically an email signature manager, i.e. it keeps track of e-mail signatures, and pastes them into your e-mail.
Recently, I started seeing some ads in the top of pages. I went to MSDN... there was this banner inserted. It wasn't all pages... but it was troubling. Had I picked up some sort of adware? Or malware?
Apparently I had... Wisestamp now inserts ads in every page if you use the freeware version.
Shouldn't they have to advertise this sort of switch? And even moreso- if they change their functionality, shouldn't chrome reauthorize the extension? Needless to say, it's gone. If they had been upfront about it, I would have evaluated whether I wanted this... but as it stands, they basically slipped it in, and lost my trust.