Dear Sir,
I have a wide experience in Firefox extension development. I've already created more than 15 different extensions. You can check examples of my work here:
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Some other examples also can be provided.
As I understood, extension will send URL to your server. And the script will return parameter which need to be added or replaced. For example(aff=myid). Am I right?
I also have few ideas how to improve your plugin. I'm ready to share them with you after accepting my bid.
Please, feel free to contact me if you have any questions.
Best regards,
Viktar Liaskovich.