Unable to uninstall firefox 3.8 extensions and plugins

[lifewire]

Hi,

I have recently upgrade my firefox version 2 to Firefox 3.8 . now some of my extension does not work properly, and i want to disable some extension and realone player download plugins. but i am facing problem in uninstalling them. i am also facing problem in disabling the Extension and plugins. please tell me how to uninstall the extension and plugins in Firefox 3.8.

[johnson22]

Extensions installed under Firefox 2 may be incompatible and/or require updates to work with Firefox 3. Please report any issues to the maintainer of the extension. When you install Firefox 3 all of your Extensions and Themes will be disabled until Firefox 3 determines that either a) they are compatible with the Firefox 3 release or b) there are newer versions available that are compatible.

[Techno01]

Poorly designed or incompatible extensions can cause problems with your browser, including make it crash, slow down page display, etc. If you encounter strange problems relating to parts of the browser no longer working, the browser not starting, windows with strange or distorted appearance, degraded performance, etc, you may be suffering from Extension or Theme trouble. Restart the browser in Safe Mode.

When started in Safe Mode all extensions are disabled and the Default theme is used. Disable the Extension/Theme that is causing trouble and then start normally.

[Trio]

If you uninstall an extension and plugins that is installed with your user profile (i.e. you installed it from a Web page) and then wish to install it for all user profiles using the -install-global-extension command line flag, you must restart the browser once to cleanse the profile extensions datasource of traces of that extension before installing with the switch. If you do not do this you may end up with a jammed entry in the Extensions list and will be unable to install the extension globally.