- Dark Reader: It will make you unimpressed by the news of a website adding a dark theme, as everything will be displayed in a dark theme, which you can tweak, by default. You can also choose that certain websites be displayed with their original stylesheet.<p>- Video Speed Controller: control the speed of videos on many websites. You can speed up to 16x and down to 0.07x. Speeding up to 16x is useless for talks that don't link to their slides but show them on the video. You speed up an hour long video and see just the slides in about 4 minutes. If you deem there's enough density or that the treatment is adequate, you can invest in watching the whole thing.<p>- YouTube Captions Search: "It's like 'ctrl + f' (or 'cmd + f'), but for YouTube". search on a YouTube video's captions. It's useful in many ways. One way is when you have already watched a video and liked a segment addressing a topic. You can go to the video, click on the icon, type in a word from that segment, and it will display the occurrences of that word with their timestamps and context/sentence they're in. You then click on the one you want to go to and it'll take you to the timestamp. One other way is if you want to know if a video addresses a certain topic, but the video's title or description do not mention it: you type in the keywords, and you'll find out.<p>- Just Read: it is amazing. If you read a lot of content and pages on the internet, Just Read is akin to an IDE's "Zen Mode" or "Distraction free mode. Ctrl + Shift + L and it'll take the page, change its layout only to the main article, removing stuff on the side, ads, all the superfluous. It is <i>appeasing</i> and you only notice how noisy pages are when you use that. You can configure the font and font-size / css to apply to the page. I've set a <i>large</i> font and it looks like a reader.<p>Recent ones: "High Resolution Downloader for Instagram". I can't stand Instagram's tiny image sizes. This makes it possible to click on a photo and have two buttons appear, one to download, the other to open in a new tab with the real size.<p>These are in addition to the usual extensions to keep one's sanity on the world <i>wild</i> web.