But Yahoo has, of course, gotten very devious in its attempts to encourage free users to switch to paid ad-free accounts. Currently they put an ad, which looks like an email title, above the first line of email on the email list page. I've been seeing gibberish such as "Amazon.com AD YAMAZAKI home Tosca Key Rack". I haven't clicked on that crap, don't know if there is such a product (doubtful!) and I don't know if it has anything to do with Amazon, but it apparently is there specifically to annoy users enough to switch to a paid account.
After the gibberish ad campaign started, I began clicking the drop-down arrow on the right which gives options "Why this ad?" and "I don't like this ad." Clicking on the latter produces a box stating "before you close this ad, tell us why you don't like it" then 4 options; 3 are prefilled plus a blank line to fill in your own. If you choose the first option, "Offensive", or any of the others for that matter, that produces a prompt to sign up for a paid ad-free account. Then the same ad reappears next time you bring up the email list. Therefore, using the "I don't like this ad" sham tool simply tells the ad software to keep putting it there.
So you can right-click on the ad in Firefox, select Inspect Element, drill down, and these appear to be culprits:
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