i’m using version 2.0.0.20 and certain sites make this top portion drop down and in the top right hand corner a button says Install Missing Plugins and to the right a red x:
is there a setting so that it never asks you if you want to download plugins?
But back to the original question, what plugin is missing? Is it the same one all the time (like Flash or something)? If you want to make plugins not work something like NoScript should prevent them from loading and giving you the red X, but it will be a challenge finding an old version.
Firefox 2.0 is no longer supported and the last update, Firefox 2.0.0.20, is affected by several vulnerabilities fixed in newer versions of the program. All users are urged to upgrade to the newest version of Firefox.