Honestly I knew that that coupon websites were adding their affiliate link to links from their websites, but it never occurred to me that the toolbars would be stripping and replacing affiliate links from actual links you were clicking yourself.
I wouldn't mind if they were transparent about what they were doing or gave you the option to substitute your own code specifically. I'm sure there are a lot of situations where I've clicked an affiliate link to check something out and then that affiliate got credit for other things I've purchased hours or days later. I'd really like a toolbar that let me modify or block the affiliate code from those links.
When I'm actually looking for coupons I tend to use an incognito window, but there are times when I'm clicking a link from reddit to see something someone has mentioned and then later go to the same site and buy something I was planning on buying and in those cases if the original link had an affiliate code, I'm pretty sure they end up getting credit for the later purchase that they had no involvement with.
I wouldn't mind if they were transparent about what they were doing or gave you the option to substitute your own code specifically. I'm sure there are a lot of situations where I've clicked an affiliate link to check something out and then that affiliate got credit for other things I've purchased hours or days later. I'd really like a toolbar that let me modify or block the affiliate code from those links.