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Firefox is on the brink of being dropped by the US Government
(www.brycewray.com)
This is a most excellent place for technology news and articles.
I forget what specific site it was, but I recently experienced this with some website a doctor's office uses for online appointments. The site straight up said that it didn't work with Firefox and to open it in a different browser. I ended up having to use Edge because I uninstalled Chrome as soon as I had switched back to Firefox.