When trying to pay monthly premiums, certain web sites/companies do not recognize my username and password. A few other web sites cannot process my credit card information. Some web sites do not recognize my captcha response even though it is correct. I can use MS Edge without any problems on the same web sites. My privacy setting is set at 'standard'. I've uninstalled Firefox and reinstalled the program several times to no avail. I've shut of all/any option to allow everything to be received e.g. popups, tracking, cookies, etc. I've cleared all cache, cookies, etc from the browser but still have the problem. I've been told by one company that their online software does not work with Firefox. If I can't use Firefox on a few web sites then I will be forced to change browsers and after 10, or more, years of committing to the Firefox browser I really don't want to start over with another browser.