Last week, I made a browser extension to filter the problem set on CSES by picking the topics, and my current progress on those problems. I made it mostly because I want to learn how to make a browser extension, brush up on my javascript, and have some motivation to go to CSES more often. It's fairly simple (it just adds a small menu to the problem list) , but I thought I'd just share it here in case anyone is interested and wants to add it to your own browser.

• The code for the extension is on Github.
• Link to install it on Chrome: https://chrome.google.com/webstore/detail/cses-problem-set-filter/klbfimgoecggkhemnoijobhnmjeoflhb?hl=en
• Link to install on Firefox: https://addons.mozilla.org/en-CA/firefox/addon/cses-problem-set-filter/