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In my tests, simply removing the if (mutation.target.tagName === "FORM") { filter was enough to fix the problem on that page, but I don't know why the filter was introduced in the first place, so I'm opening this issue :)
While developing mozilla/fx-private-relay#743 I noticed that the filter applied in the mutation observer is causing some fields to be missed in at least one case: https://github.com/mozilla/fx-private-relay/blob/ec83888b1703ca5e80af38d3ec1b01993819b2fd/extension/js/add_input_icon.js#L319-L329
The URL I was testing on is https://subscribe.washingtonpost.com/checkout/payment/?promo=o17_eu_ba&pricingStrategyId=11&tid=privacy_wall
In my tests, simply removing the
if (mutation.target.tagName === "FORM") {
filter was enough to fix the problem on that page, but I don't know why the filter was introduced in the first place, so I'm opening this issue :)