Blocking Spam Websites from Google Search in Firefox

Whenever I try to use Google to look up a programming or tech related problem, my search results are often filled with useless spam. Most of them are either low-effort blogspam tutorials *ahem* or are just GitHub or Stack Overflow mirrors. It's unfortunate that despite me constantly clicking and immediately bouncing back, they still rank quite high in search rankings. In addition, Google also does not allow me to block certain websites from my personal search results.

Luckily, there is a little known feature in Firefox that allows us to create our own search engine using bookmarks. Bookmarks in Firefox can be aliased to a shortcut so that it can be quickly accessed by typing the alias in the search bar. In addition, we can also type additional text after the alias which will get substituted into our bookmark URL with the %s variable.