Do you have any Amazon add-ons (extensions) installed in Firefox? Did you, or someone who uses your computer, install any software recently?
If it is a Firefox add-on causing the issue and you have more than one that could be the culprit, start by disabling all of them. If that fixes the issue, then it is just a matter of enabling each add-on (one at a time) to discover which one is causing the issue. When you figure out which one it is, uninstall it.
RFK's campaign was never about any kind of message or policy issue or even actually trying to win.
His goal in all of this was to exploit his family name to try to bleed off some of the votes from Biden to help Trump win. Now that Biden has dropped out and Harris has taken his place, Trump is getting worried that RFK might actually get more Trump votes than Harris votes. That's okay, I was never going to vote for either RFK or Trump.