Go to the search box in the lower left corner. Type "control panel." Your familiar control panel will come up. In the top bar, change the view to "small icons". Look for "Add or remove programs." You can remove anything you want to. The bloatware is not inherently part of Win10, it's what your PC manufacturer put on.
Then right click at the top of the control panel and "pin to taskbar". I removed all the tiles and put what I wanted in the taskbar.
Right click on the desktop, and you can change your theme to one with a nice background color and font that you like.
You can download and install Firefox any time you want.