If you right click on your toolbar, there is an option to customize your toolbars. There should be a Clipmarks icon you could drag and add to your toolbar.

Another place to check would be the Clipmarks extension preferences. Go to Tools > Add-ons to see all your extensions and each entry should have a preferences button (if they choose to implement it)

You can also try to delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions

If you see disabled extensions that are not compatible on the next start in "Tools > Add-ons > Extensions" then click the "Find Updates" button to do a compatibility check.

I found no clipmarks icon as suggested

I would like to thank JYOuyang as this person helped solve my problem. How simple, but if a person doesn't know. Thank You.

You're welcome, rexeddie. Happy to be of assistance.

Check out the Knowledge base if you have any other questions.

@ JYOuyang - Thanks ! I'm like, "Duh!" - but I'm pretty sure the Clipmarks icon wasn't in the options dialog until I installed the latest version.

Cheers, Mark