At long last, Mozilla has managed to calculate how many Firefox users have at least one add-on installed: 85%. It gets better, though: the average Firefox user has no less than 5 add-ons installed — but considering over 2.5 billion add-ons have been downloaded in the last 5 years, that’s not all that surprising. In total, 580 million add-ons are used every day by the Firefox user base.

On the flip side, over in Googleland, only one third — 33% — of Chrome users have an add-on (extension) installed. The most telling statistic, though, is that Google has only served 70 million extensions and themes — a puny fraction of the 2.5 billion dished up by Mozilla. It’s worth noting that these Chrome statistics are six months old — but given how Chrome automatically updates, and how it doesn’t suffer from the same add-on compatibility issues as Firefox, it’s safe to assume that the percentage is still around 33% today. The total number of downloads will have climbed significantly — but it’s unlikely to be much over 100 million.

我替朋友安裝firefox，也只幫他們安裝adblock plus，以及訂閱好需要的名單 。其他就讓他們自己發掘。
他們也算是這85% 的一份子了 。:P

這份圖表有趣的是，使用firefox4 但不安裝套件的用家比率越來越多，但firefox 的用家數量好像並沒有明顯增長...

到 Mozilla 官方的部落格看原始文章可發現統計日期為 3/22~6/19，
主要是 Firefox 4 推出後更新的使用者越來越多，
但使用套件的比率其實只有小幅下滑而已，
即圖中那條藍色虛線所示 (89%->85%)，
另外也可發現週末使用套件的使用者比率會微幅上升。