You'll need to be a little more specific about requirements, especially price range.

I've used VideoDownloadHelper for Firefox, and it works great (except you have to pay some sites like Youtube). It's also available for Chrome.

Seriously though, the new buddy pokemon system is nice, but I wish real tracking was fully deployed. Fix the broken features before introducing new ones.  ::)

First of all, almost all non integrated webcams are wired over USB 2.0, not USB 3.0. Other than a few high-end Windows tablets, most integrated webcams are also wired over a USB 2.0 bus. USB 2.0 does not provide enough bandwidth for uncompressed HD video, so it requires the camera to compress the video before sending it (MJPEG and H.264 are the most common).
MJPEG is computationally cheap, but provides poor image quality and compression, so it limits the frame rate of the video to around 5 FPS at Full HD and 10 FPS for HD video.
H.264 requires fairly expensive hardware encoders but it can provide Full HD video at 30 FPS over USB 2.0.
Another issue is software. Some software can still only work with uncompressed video, limiting them to using low-resolution streams. Most support MJPEG today, but very few support working with H.264 streams, falling back on the older MJPEG or sometimes even uncompressed.
Hopefully, this cleared this up.

Everyone starts out nude, but nobody has a choice about what their character looks like - including their sex. And it's permanent.

I have a TP-LINK router (TL-WDR4300) with OpenWRT and it runs super stable (current uptime 185 days  ). It's not really suitable for novice users and is somewhat of a crap shoot, though - the previous TP-LINK (TL-WR1043ND) I had with OpenWRT would need constant reboots because the WIFI stopped working.