Why can't I open some sites and videos in youtube?

A few days ago it started with youtube. I wasn't able to watch videos and at the beginning didn't think much of it( i had the problem before but not for so long ). Then I tried to find the solution in the web but then I noticed I couldn't open a lot of sites like the Opera download page or the "uninstall flash player" page. I tried everything what was suggested in here :http://support.mozilla.org/en-US/questions/931459#answer-349737 but nothing helped. I thought if I find where the problem whit youtube is I would find the solution for the sites . btw I wasn't able to update Java too. So, can somebody help me, please?

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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