Arnoud van der Veer wrote: > i cannot watch anything in Iceweasel on Youtube
First, go to www.youtube.com/html5 and set YouTube's HTML5 player to be used wherever possible. This setting is stored in a cookie. Then, for those cases where html5 is not yet available, UNinstall flashplayer-nonfree. Adobe has stopped Linux support for it, so it's too old for those cases that require a newer version. Instead, install pepperflashplugin-nonfree. Whenever a flash video does not work in iceweasel, you can view it in chromium. But if you also install browser-plugin-freshplayer-pepperflash, then you can view them in iceweasel as well as other NPAPI web browsers such as seamonkey and the new vivaldi browser.