I have questions about websites I visit that don't seem to work in Firefox, but when I visit the same sites in Microsoft Edge, the sites work fine. Previously (one site, 6 months ago, the second, in the last month), I had no issues with either site. It makes me wonder whether some protocol or requirement has changed that has caused my recent experience. Both sites are secure sites (banking and bill-paying related), and when I first experienced it, I didn't give it much thought since it happened while using the Windows 7 machine. I am now using a newer Windows 11 machine. My most recent visit to the municipal site (water-bill payment and statement download) resulted in the new tab displaying HTTP Status 400 - Bad Request Type Status Report Message Please provide a ref. Description The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). Apache Tomcat/9.0.110 At the credit union site, I click a link that results in rotating arcs atop the webpage's background, and it neither times out nor displays the next screen (a link to a specific account). When I use the credit union's app on my smartphone, the next page displays as it should. (A message reply by the credit union showed a lack of understanding.) Most of the Firefox settings are at its default settings, and the two sites are allowed to open pop-up tabs. After 30+ years of using Firefox trouble-free, reverting to Edge is a step backward. (Every time I finish using Edge, I have to run my spyware program.) Thanks Rapidman