download video from youtube without software

There is a good news for all of you...
in this post, I will tell you how to take a video from youtube without software.
here we go...
1. open your web browser (mozilla firefox is recomended)
2. on the web address, write about:cache

3. click enter
4. you will see a window like this:

5. look at cache directory. That is an address to get videos that you watch. Follow the text that written. Every computer has different address to access cache
6. after that, click on size to sort the cache size started from the biggest to the smallest size.
7. video usually has big size, look at the upper side. Click on a biggest size file then press f2 on your keyboard then change the extension of the cache with adding .flv at the end of the cache name (usually written by number)
8. press enter and then open it with flv player
9. copy it and paste into your folder