436773 firefox extension modification

I need a featured added to a firefox extension I use. Message me for a zip with the .XPI extension for you to see the code. Please create a copy launchable from menu view->sidebar->FB Ads Manager 2 so I can test your modified version separately from mine. The plugin auto submits ads to Facebook Ads. For example, I can add multiple ad copies, and multiple images. The tool will then submit for example 10 adcopies X 5 images = 50 ads created. I want a checkbox added that, when checked, will in this example create only 10 ads, using any random image from the 5 (or more) added. So again, with this new checkbox checked, if I were to add 30 adcopies, and 20 images, it will create 30 ads, and choose an image for each adcopy at random, some images will be used twice, but the tool should maintain even distribution/usage. Please tell me how you will test the app, if you have a facebook account to test ads in, if you want to send me the work in progress and I give feedback. I will pay but I understand the concern in handing over the code prior to full payment. Open to options.