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Re:Firefox 4 Beta 1 Released by aboodman on Tuesday July 06, 2010 @08:59PM (#1492939)
You are comparing the first mass-market release of Chrome extensions with the first alpha release of Jetpack, which isn't fair. A better comparison would be the first dev channel release of Chrome with support for extensions. That was May 14 2009:

http://news.cnet.com/chrome-extensions-draw-near-but-advance...

... which is slightly before the first Jetpack alpha which was May 20 2009.

In any case, the issues that both extension systems try to address have been well-known for some time. It isn't surprising that multiple people came up with similar ideas on how to fix them.

ninja edit: Got timelines mixed up first time 'round

Re:Firefox 4 Beta 1 Released by natmaster on Tuesday July 06, 2010 @09:10PM (#1492961)
Interesting catch. Reminds me of Mercurial and Git births (in that they both were independently created around the same time to solve the same problem).