It could be the server this site is on having problems or your internet provider. I've had days that I couldn't go one to some sites and others were fine. My internet provider said the routing tables were screwed up.
If you're typing a post, you can hit ctrl-a and you'll highlight the what you've typed so far, then ctrl-c and it will copy it. Same as above, just done with keyboard shortcuts. ctrl+x=cut, ctrl+v=paste, ctrl+z= undo, ctrl+y=redo. I likes my shortcuts. Windows key +d=show desktop(d for Desktop) +e=my computer(e for windows Explorer) +f=search your computer(f for Find) Windows key then u(shut down), then r for Reboot, Alt+F4=Close whatever program you're working in. Alt+tab switches between your open windows. Just for switching between the window you're in and the last one you were in, alt tab, then to switch again, alt tab again. You can move through them one at a time by holding down the alt key and pressing the tab key repeatedly -go too far? keep the alt key held, hold the #$%*(ha ha, oops, I tried to spell shift and spelled sh!t) key and press tab and you'll go back one in the list. For switching between tabs in firefox, ctrl+tab will move you one to the right, ctrl+shift+tab one to the left, ctrl+1 will take you to the first tab, ctrl+9 will take you to the last tab.
There are tons more, but those are some I use regularly. Did I mention I like shortcuts?