I recently did an update on my Firefox and have Quantum 57.0. Every time I click on something on a site I am using, another tab opens with an ad. Why?
If a new tab doesn't open, an ad will be open in a new window behind my firefox windows.
If a new tab doesn't open, an ad will be open in a new window behind my firefox windows.
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Try this add-on: https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/
(Sounds like you were infected with ad-ware)