The forms were working for us in Firefox this morning. Firefox updated to v103.0.1 the other day, but that didn't include a fix, so I'm guessing the Constant Contact devs fixed it. (One of the programmers I work with thought it was a broken function testing to confirm the browser was Firefox and that Firefox v103 wasn't validating.)
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Aha, we've just been adding the parameters to each link after building the newsletter. I can see shortlinks would avoid the issue if we want to keep using the extra tracking.
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