Why do plugins survive a fresh re-install?

Last night I noticed I was still on FF 8.x, and the current version was 10.x, so I decided to upgrade. My 8.x install is littered with bits of old addons, unused about:config entries (that I have no idea how to delete), etc. So I uninstalled it, blasted its install folder, and its data under my User\AppData, both the'Local' and 'Roaming' folder.
That should be enough.. right? Nope.
On opening the freshly installed copy, it had no addons installed, but it did have several plugins installed. They had disable buttons, but no uninstall buttons. Nor was I notified they were installed/transferred, or given a chance to stop it. (On first run, I chose not to import anything)
Why does Firefox do this? Sounds kinda shady to me.

If you set this pref - '''plugin.expose_full_path''' - to true in about:config, you'll see in the about:plugins tab where those plugins are actually sitting on your hard drive. They are not in any Firefox folders, that was banned by Mozilla back in Firefox 3.6 for newly installed programs that contain Firefox plugins; as of like Firefox 5 that old plugins folder that used to be in the Firefox program files doesn't even exist any longer ''(although users can create that folder and drop plugin files in there themselves)''.

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        Why is creative cloud update failing to install?  created by Brucgovn
    <https://forums.adobe.com/people/Brucgovn> in *Creative Cloud Download &
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    <https://forums.adobe.com/message/7475697#7475697>

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