One way is to run multiple instances of browsers. Or use different tabs. What I do is to right click and "open in new window" (or tab). That way you have the original page to refer to and try again with the same wheeze. Or in extremis I save and edit in Word and get the URL that way (see below).

The reason the link fails is probably lost packets. If you are using a public access PC they may have screwed-down the system to prevent idiots "loading things they shouldn't and don't understand why it matters". Or the ISP is monitoring your surfing so that government can leave it alone. That monitoring can overload the system. I get sluggish loads and no loads all the time at the library here in the UK.