Install Missing Plugins

Hi
i have one problem
i can't see pictures box in every web site because
i receive message
" Additional Plugins are required or display all the media on this page "
then i can't install missing plugins
plz help me
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Can you give a few hints, like giving the program, and version, which you use, and the plugins which you try to install?
Plugins are, usually, .dll files which are placed in the Plugins folder of, primarily, programs like Netscape 6/7, Mozilla, or Seamonkey. They are, usually, not needed for Firefox.

 

I'm not at all sure that's a true statement, Westside. I show numerous plugins in my FF installation. More information can be found here and here.

 

Jim, that was my quote, and I bolded the "usually" part. As far as I can see the .dll files are not needed in Firefox. Firefox seeks the program out of which the .dll files come. I have one installation of Firefox3.0b2 which works, perfectly, well with no other .dll file than the npnul.dll.
In case what I said was not clear, the programs must be installed, but their presence in Firefox is not needed. The Firefox3.0b2 install has all the needed settings for the installed programs (including Quicktime) in Tools|Options|Application. Such settings are also available in FF2.x, in Tools|Options|Content|File types. At least as far as I am concerned.
Also the word "plugin" is, often misused. The installed program is one thing, and a link to it, is another one.
Of course, I may be mistaken, because my default browser is FF2.0.0.12, which has .dll files for a number of programs. From what I see only Quicktime has recent files. All others are 2-4 yrs. old.
By the way, I don't understand the significance of the links given.