Just an additional clarification in case the other reply doesn't help: Your phrasing of "shows me a black formation" doesn't make sense unless it is rendering the page wrong for you. All the problems you've listed show both white and black stones on the board.
For example:
> In 2.16:
> 3 says I'm wrong for saying its alive. It's clearly alive. It's a big black formation with one eye in the corner and one eye at the bottom
Should look like:
|
| w w w w w
| b b b b w
| w b w
^^^^^^^^^^^^^
(I'm also using Firefox and it's rendering correctly for me)
For me 2.16 3 looks like:
|
| B B B B B
| B B B B B
| _ B _ B B
^^^^^^^
Link to screenshot: https://imgur.com/a/odDYg9K
When I use Librewolf I think I get the intended render, but using Firefox this is what I get