Can't remove Obselete Firefox Startup Entries

How do I remove the obselete Firefox entries? Like when I click tools and Firefox and click for example on Java Console 6.0.21 or 6.0.22 or 6.0.24 I can not delete them and many more old entries that are older than newer ones etc.... :huh: I have CCleaner 5.08 64-bit and Firefox 40.0.3 using a Dell Inspiron 7746 with windows 8.1 64-bit.

hello babyface 1968 :)

for your old java-versions you can remove this with install a newer 8 and higher version.

if the manually deinstallation dont work, try please the java-uninstall-tool.

http://www.java.com/en/download/faq/remove_olderversions.xml

the other option is directly into the firefox settings to deactivate ...

tools (extras) --> addons --> extensions/plugins -->

--> select the plugin you want --> never activate

or

--> select the extension you want --> deactivate

after newstart of firefox it works

you can all items reactivate in the same way with "allways enable"/"activate" or "ask if you want to activate"