Firefox Browser does NOT open and what is Firefox Release?

According to everything I CAN see, I have Firefox 150. I am still using Windows 10 and I don't seem to have problems with that. However, I CANNOT get to the Firefox Browser. I am very frustrated with only seeing Mozilla this, Mozilla that, but not Firefox. When I go to the help section I am able to click on Firefox Browser, so I know you still have it. The main item that is very different is clicking on Firefox to open it, and then seeing 3 different ways to login. I'm at a loss, and I'm frustrated. Please help me so that I may sign in to Firefox BROWSER.

By the way, when I click on Themes-Add-ons for Firefox and choose what I think looks like PINK, it isn't pink! It's a very strange purple color. I want PINK. Thank you, RhonCa