I haven’t used this extension before but it seems like what it does is find the URLs of active videos. You can do the same manually by F9(or right click > inspect) > Network > Media > Sort by size (larger files will probably be video). This will give you the URL of the video (same as if you right clicked and chose “open video in new tab”, but some sites disable this).

This approach usually works for me, but many sites take steps to prevent it.

1. Send several smaller video files. They basically cut it up into short videos so you can’t access the whole thing at once. ffmpeg or a download manager (I use TurboDownloadManager) should be able to combine them relatively easily. Until recently, YouTube used this sort of method. The URL had a “range” tag that specified which frames of the video to show. Deleting this tag gave the whole video. They’ve since changed it and I don’t know any similar tricks (just use yt-dlp for YouTube). Other sites may do something similar, like changing a number or keyword in the URL will get you the whole video.

2. Serve a preview of a full video (that you have to pay for). Many sites have very similar URLs for free and paid videos. On some sites you might be able to guess what you need to change to get the full video. Some sites have their previews named “preview.mp4” whee the full vudeo is the same URL but named “video.mp4” or something like that. You can spend some time messing around if you find something like this, but really the chances of guessing correctly are pretty low.

3. Encrypted keys. This is basically impossible to crack. Some URLs will have long strings of letters and numbers in them. I assume this is some sort of encrypted password that needs to match up for you to access the video. Don’t even try with these ones.

TL;DR usually it’ll work. Sometimes it won’t but you might be able to get around it.

Also, yt-dlp works on much more than just YouTube. If I can’t figure out how to download a video, I’ll just give the URL (the webpage, not the direct video URL) to yt-dlp and it’ll often work.

Screen record a video of the process? Then you’ll have a video guide, plus you can take screenshots of the video for a written guide.

You can do pretty much the same thing with Firefox: you sign in to Firefox to sync your passwords and browser settings, then (assuming you’re talking about Google calendar, Gmail, etc.) You can sign into your Google account with one click. That’s not really any less convenient.

Besides, I’ve hardly ever heard of anyone moving away from Firefox to Chrome, so I doubt the reason is any sort of convenience or design superiority. I’d attribute it to the fact that most people who already use the Internet (pretty much everyone) has already settled on a browser, with chrome-based browsers being the most common. So anyone new to the Internet will just choose the favorite as the default. This is especially true considering they most new Internet users are probably kids, so they’re not aware of concerns about privacy, monocultures, DRM, etc. that would drive someone to pick Firefox.

Basically, it’s not that Chrome is actually better than Firefox. I think it’s that the market is growing, and the most common browsers will grow more quickly than Firefox simply for the sake of familiarity.