Yup, I'm using this now as suggested by you

But the problem is sometimes I won't be able to see the full video (i.e. it ends prematurely) and it requires VLC to play.

To add some information here, actually the Video stopped prematurely was because I was using VLC

Changed to a free and simple FLV player and it works flawlessly

I'm using this extension too, so far so good, works with FLV player as well

Not FLV player itself. I install FLV player just for the codec

I play with Media Player classic and I can fast forward or directly jump to anywhere in the progress bar

Threads merged and made official

I'll update the first post if I've time

And regarding the YouTube problem that you're suffering, I guess you're not the only one.

Some videos can be viewed very smooth, but most of them not. I then tried to use VideoDownloader extension to save the video to my HDD, and the download speed is just around 15KBps (for my 1mbps line) which is very disappointing.

Thread moved from software main forum