gahhhhhhh i just upgraded an hour ago and i ran into SO MANY PROBLEMS!!!!
first after installation, i tried to run firefox and got an error saying not to use netscape's java plugin for IE, after quite a bit of researching, it turns out that it was because i used a plugin to change the agent switcher string, after A LOT MORE googling, finally found a solution after 30+mins
then when it finally loads, half of my extensions could be updated automatically (i have about 30), another half of what's left had to be manually updated. The rest do not have a compatible version so i lost. So of those plugins that i lost i don't care about, but there are a few which i really depend on such as the "session saver" which when starting firefox opens the tabs which you have up when you last close firefox
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