If I go to buy something, I switch off ad blocking on that page, at the very least, on the checkout page. Ads can even be actually relevant there.
If the page is too ad-ridden to tolerate, I may consider to just close that page, and go search for other options.
I use Firefox + uBlock Origin, because going to the wide commercial internet without some form of ad blocking is like going out without an umbrella when it's raining heavily.
Usually checkout pages don't have pesky ads galore, or any. But such a page usually has a ton of anti-bot scripts, such as captchas and other privacy-invading checks.
Ad blockers usually block such stuff, for a good reason. But I don't mind it on a checkout page specifically though, because on a checkout page I wilfully disclose a ton of my private details, such as name, address, etc.
Good checkout pages work well with an ad blocker on.
They removed wording in their FAQ saying that they wouldn't sell data. It's a subtle distinction, and may or may not make a difference depending on your perspective.
It's just the paradox of when you present yourself as "the good guys" - people will hold you extra accountable for things that others easily get away with as nobody expects them to do better.
Unfortunately, Mozilla tends to shoot themselves in their foot this way somewhat often.
Being the good guys is the only reason anyone still uses Firefox. If Mozilla doesn't want to be the good guys, we'll use one of their many forks that remove the bad guy code.
If the page is too ad-ridden to tolerate, I may consider to just close that page, and go search for other options.
I use Firefox + uBlock Origin, because going to the wide commercial internet without some form of ad blocking is like going out without an umbrella when it's raining heavily.