You have got the question the wrong way round, Firefox has not stopped supporting your addons Delicious need to update to FF4.

Hi Andy, thanks for your reply. I'll keep checking the Delicious website for signs of the update. In the meantime I have now downloaded the previous version of Firefox with the bookmark add ons installed.

There is a fix which I found at this url: http://forums.macresource.com/read.php?1,1125540,1125571 It links to another site so I've copied the quote from that site:

   From the menus select Help > Troubleshooting information
   On this new tab, near the top, you’ll see a field called Profile Directory. Click the button in the field to launch Finder (File Explorer for Windows).
   In the window which has popped up navigate to the extensions folder. Inside that should be another folder named “{2fa4ed95-0317-4c6a-a74c-5f3e3912c1f9}”. Inside this is a file called install.rdf
   Open install.rdf in any plain text editor.
   Around line 8 you should see some XML which looks like this: em:maxVersion="4.0b3pre" />
   Update this to em:maxVersion="4.0" /> (See we removed the b3pre bit?)
   Save the file and restart Firefox.
   Boom. The delicious extension will now work.

Thanks Jelby, I can can confirm that it worked!

Hi Jelby, thanks so much for posting this fix. I can also confirm that it worked!

Thanks Jelby, had to right click on Menu Bar, customize, and then add the delicious buttons. Good job. Mac