The browser/clientside extension works nicely as I've installed it as well.
The problem is, the PB-pics only become available for those who have installed the extension themselves.

But a better solution is to simply get the pics working again for everyone.
On the forums I run I was able to 'fix' 95% of the missing/screwed up Photobucket pics and copy them to the forum's local server so they started showing again.
This was a 2-step 'script' written for phpBB forums by someone. Won't work on this forum unfortunatly.