I would say that the 30% market-share Firefox had in 2009 was breaking the monopoly much more than the 3% Chrome had a time. Sure IE6 had many non-standard API

I would say that the 30% market-share Firefox had in 2009 was breaking the monopoly much more than the 3% Chrome had a time. Sure IE6 had many non-standard APIs, but even the fact that all hobbyist browsers back then were implementing tabs and IE6 never had that, speaks to its stagnant development. To be honest I'd prefer some things Google is now pushing through th W3C as standards to be left as Chrome specific APIs and leave the rest of us alone.