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just like large part of GOOG revenue comes from Google being the default search engine in Firefox,

some day Mozilla may pull the plug and switch to some other SE i.e. Bing or DDG

Very true - it's definitely a symbiotic relationship. I doubt DDG could drop $300M a year, but MSFT could. Mozilla isn't going to give up that kind of $ just to hurt Google. The numbers vary by source, but across the board you see that FF's market share has dropped by about 1/3 or more since 2009, so every month that number gets lower (which seems to be the trend), FF becomes less and less valuable to Google.

You should probably link your numbers, as from what I know, that's pretty much FUD. In fact, Firefox has gained market share over the past month.

http://en.wikipedia.org/wiki/File:Usage_share_of_web_browser... (same marketshare now as in 2009.)

Should have been clear. I wasn't saying beginning 2009, but their high in market share, which was late 2009. See http://en.wikipedia.org/wiki/Usage_share_of_web_browsers, which contains the graphic you linked to. In November 2009, FF's market share hit it's high of 32.2%. January 2013: 21.4%. Not FUD: the graph you linked shows the same. That's a reduction of 33%.

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