Tools / Startup

Several plugins and extensions are shown multiple times and others are greyed out and some have version numbers shown as 0.0.0. What should I do about them?

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So as to not invite a headache I wouldn't delete any of them, just leave 'em be.

If feeling adventurous I'd disable the questionable ones, and if something hiccups just re-enable them.

Check the PRODUCT column. For me several plugins appear with the same name, but I have both Firefox and Seamonkey installed. The product column will tell you what application they apply to.