What challenges do you anticipate in completing the project?
I've read your job post very carefully, so I don't think there will be any challenges that I haven't experienced and dealt with successfully before.
Proposal:
As you can see from my profile and 5 star reviews on it, I have a lot of experience with browser addons, so I'm sure I can help you to bring your idea to realization.
I have analyzed your job post, and everything is clear to me. I'd like to confirm some things though:
When user clicks on checkbox on the left of organic result, should our addon automatically make next search with negated domain from that result? Or user would click on any amount of checkboxes on result page, and then have additional button which would make next search with negated domains?
We can discuss this whole workflow of addon in chat to make everything clear.
Regards,
Stefan