Funnily enough, one of my first GreaseMonkey scripts that I wrote 9 years ago was one that added the ability to collapse threads here on HackerNews [0]; this functionality was finally added in the past year or so to HN (not based on my implementation).
Worked like a charm back in the days :)
Another more popular GreaseMonkey script of mine was the Wikipedia TeX Source Extractor [1]; I used it extensively during my studies when writing lecture summaries, papers, or my thesis.
Userscripts are definitely fun and can be quite useful.
Update: After not having touched the code of [1] for over 8 years, I just updated the userscript to work with Firefox 75.0 and the GreaseMoneky add-on v4.9.
Worked like a charm back in the days :)
Another more popular GreaseMonkey script of mine was the Wikipedia TeX Source Extractor [1]; I used it extensively during my studies when writing lecture summaries, papers, or my thesis.
Userscripts are definitely fun and can be quite useful.
[0] https://github.com/giu/hacker-news-threadify
[1] https://github.com/giu/wikipedia-tex-source-extractor
Update: After not having touched the code of [1] for over 8 years, I just updated the userscript to work with Firefox 75.0 and the GreaseMoneky add-on v4.9.