First you need to be a little more detailed in your explanation.
Provide your distribution and release level.
Provide the version of Firefox/Mozilla you are using. Help>About.
What plugins are you trying to install? They all have their own little quirks.
Try Searching the Forum for each plugin.
These are the one's I have installed. If you are using a distro that supports apt-get, installing most of them is as simple as apt-get install acroread (example).
Plugins (7)
* Helix DNA Plugin: RealPlayer G2 Plug-In Compatible
* DjVuLibre-3.5.14
* QuickTime Plug-in 6.0, Windows Media Player Plugin are supported by mplayerplug-in
* Shockwave Flash
* MozPlugger 1.7.1
* Adobe Reader 7.0
* Java(TM) Plug-in 1.4.2_06-b03
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