Hi,
I need to know a few more things about the re-poster that you already have. You make it sound as though it will not be possible to reuse the old code. Is there some reason for this? Code can be extracted from both Firefox and chrome extensions, and I can edit that code unless it's been obfuscated.
I would need to see the old extension, and a more thorough description of what you expect it to do (or what it did do).
I prefer not to drone on about previous experience in my proposals--I think you'll learn more about a bidder by discussing the project with them, and I'm sure you're able to look at the reviews. Most of my experience with browser add-ons has been for browser automation, which is exactly what this project requires.
I look forward to hearing from you,
Calin