If you’re toying around with the idea of trying out Flock, but you’re just not sure if all of your favorite Firefox extensions will work, you’ll be interested to know that you can now convert your favorite Firefox Extensions so that they’ll work in Flock. When you visit the Flock website, they have many extensions already available, however not all of your Favorite Firefox extensions have been converted yet.
One of the first things that you might notice on the Flock website is a message that says:
Can’t find it here? Very soon you will be able to add your favorite extensions and we’ll convert them on the fly for you. Extensions written for other platforms can still be used in the Flock browser, but there is no guarantee that they will work correctly.
There’s also an option to find extensions using a search. If you search for an extension, but it’s not available, the image below shows the message that you’ll get:

Clearly, it probably won’t work 100% of the time given the big message in red, but there’s a good chance that it might. All you have to do is enter in the XPI file, or the XPL URL and click upload. Firefox Extension Guru tried it with his favorite extension CoLt, and it worked just fine. It looks like Flock is putting the effort in to make the transition from Firefox to Flock simple!
Of course, you can always develop your own extensions as well. There’s a great developer’s guide to get you started so that anyone can contribute to creating extensions for Flock. They offer some code writing guidelines, and advice to make it all easier for you.
Source: Firefox Extension Guru’s Blog

It’s interesting, but I’d like to point out that David “Ferrite” Dunn, over at [outraged-artists.com] developed and hosts for some time now [outraged-artists.com] a system that does the same conversion (and Pocket Flock, too!)…
Gee, where’s my stars for this tip (like I really need more stars
) ? How crazy is this, it took WordPress over 2 1/2 hours to acknowledge your pingback. 
That’s for the tip Lee… good to know.
2 1/2 hours for a pingback? dang!
Fx Extension Guru: PS – thanks for the tip- I’ve adjusted your stars.
Thanks Ashley! What gets me is both our blogs are on WordPress.
Actually, I know what happened. The post was scheduled to post slightly in the future and when we do that the server will not send a pingback…since the post is not available yet. However, several hours (probably about 2 and a 1/2) later we edited something in it and re-saved the post. WordPress then noticed that a pingback was never sent so it went ahead and did it then. If we had never edited it then there would have never been a pingback.