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I am wondering is there special plugin needed? For chrome it is fine as the video immediately play inside the tab (streaming) instead of asking me to download it.

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Browsers usually need video player plugins to stream different types of video files instead of downloading them. In Firefox, you can check if a video plugin is installed by clicking on File -> Addons and selecting "Plugins" on the left. VLC for example automatically installs one of them. – stex Jan 21 '13 at 10:49
Hi stex thanks for your tips! I installed VLC and it seems to work fine. I am wondering is there any alternative to VLC that could also install plugin in firefox/chrome? Coz I am looking for one that can actually cache the file (i.e. when you move the slider back to already streamed content, you don't have to stream again. Thanks a lot! – StCee Jan 21 '13 at 14:06
You could try Windows Media Player plugin or QuickTime plugin. – Wk_of_Angmar Jan 22 '13 at 2:14

Firefox can play WebM and Ogg Theora Vorbis files without any plugins.

Here's a Firefox Support article on Windows Media Player Plugin:

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