I updated Firefox to Version 154.0 and now I cannot search properly with/on Yahoo!

I've been using Firefox for so many years I don't use any other browser unless a site doesn't work,then I use 'Opera' (very infrequent). I updated Firefox to v154.0 and now searching does not work properly. I used to be able to enter a question into the bar/box where one would normally view any given URL, select return, and Firefox would bring up Yahoo! search results. With this update, that doesn't work. When I select return the URL that had been in the space just reappears. If I visit the Yahoo! main page and try to use the search box with the magnifying/eye-glass, it launches a blank tab. I'm forced to use the AI icon to get a search result. I do NOT want to use that feature. Also, with Firefox 154.0 I cannot remove other search engines. With every update I remove Google, Bing, Duck-Duck-Go, Wiki, Amazon, etc. because I ONLY want one search engine, Yahoo! I checked the Yahoo!Search Extension and made sure all the "allow" buttons needed were selected. I want to remove the other search engines from the Settings tab, and I would like to have the same behavior prior to the update: simply type my question or text into the main html bar/box and select return, and get results. I see that other had an issue starting with version 142 or so that was similar, but I've not had this issue until two days ago. Any help is appreciated. And yes I delete my cache etc. regularly. I'm on Mac OS 15.7.7 and again, it has never been a problem until updating Firefox to v154.