What plugins do i need get my firefox running fine again?

I deleted a lot of files to clear up memories, only i also accidentally deleted plugins. I reinstalled: Shockwave Flash, Java Applet Plug-in, Unity Player, Shockwave for Director, Adobe Acrobat NPAPI Plug-in, Version 10.1.4, Microsoft Office Live Plug-in, Silverlight Plug-In, QuickTime Plug-in 7.6.6, and iPhotoPhotocast. However, I still can't view some chats. What plugins am I missing? What plugins do you recommend? Is it even a plugin problem?

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