[Feature Req] Update outdated Firefox screenshot in the slideshow

[mrworldwide1]

The image in installer slide show should be updated, because for 3 years now Firefox redesigned its interface - pictures below. This is important to ensure Mint doesn't seem outdated, especially to new users who open up Firefox after installing the OS and see the inconsistency.

https://blog.mozilla.org/en/products/firefox/fresh-new-look-for-firefox/

Current:

Expected:

[clefebvre]

Updated for Mint 22.