Why does firefox drop support for a plugin with an update

Why the H*ll does Firefox drop support for a plugin when there is an update in Firefox.
FF4 has reported that 6 of my plugins that work fine in 3.6 are now not supported. !! This is a joke, and happens regularly.
As a user (a highly IT literate one) this is annoying and frustrating, and from a design standpoint, unprofessional.

Plugins as in Flash, Java, quicktime or such or do you mean Extensions ?
Plenty of Plugins seems to be detected and in use by Firefox 4.0 just fine according to your system details by your post.
If you meant Extensions then check for updates, look at addons.mozilla.org or the Extension homepage for to see if the author has provided a update.
Generally Extensions can need anywhere from a simple maxversion bump to a lot more for it to work properly on a new Major version of Firefox depending on what the Extension does.
It is professional actually as extensions that were not actually compatible may actually cause problems big or small if they were to still just ''work'' in a new Major version release so hence the need for them to be properly up to date on any changes and hopefully the extension author is quick about it.

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