You need first find out how do you want to style the website. You can use the devtools menu for that (F12). Then you need to create a userContent.css, and write your css there. I recommend writing your rules for given urls or url-prefixes like @-moz-document url-prefix(www.4chan.org){body{background: #111}} or @-moz-document url("www.4chan.org"){body{background: #111}} so it only has an effect on the websites you want to style.

uBlock or ReVanced

If you're still using your 14 year old android, then they probably hadn't implemented the planned obsolescence feature to that phone yet. Sometimes they forget to do that with early models.

Not on dev portfolios, they usually look better than any billion dollar company's website, and they have „more server per user” and they are also more optimized for the thing they do, so they are also a lot faster most of the time.

I say it's rather a „it mostly works” experience, but as a twist, if anything goes wrong, you can fix it very easily

MacOS is a great os, and it comes with solid hardware. If you use your laptop for anything except gaming, and you can pay premium, a mac is a really good choise. Also, it's a lot easier to develop apps for iphones from macs, and that's a thing that a lot of people do.

Yes it is

I already did, but wobbly windows is my love!