If you are engaged in any academic or scholarly research, you have probably become familiar with the Digital Object Identifier (DOI), which many publishers are including in their papers' citation information now. The DOI points you toward a stable location on the web where you can find at least the citation information for the article and maybe the abstract or entire article as well.
DOI is extremely useful, but has the one drawback that you can't just cut and paste it into your browser address bar like a URL. Instead, you have to type "http://dx.doi.org/" and then paste in the DOI. That's a pain. So, some enterprising person has created a Firefox Add-on that lets you simply cut and paste into the browser address bar like you would want to do. You use Internet Explorer, you say? Well, you're out of luck, I guess.