temporarybookmark feature for browsing. Something where I can mark a URL as something I want to read later. Not a permanent bookmark, just long enough to hold it until I get to it tonight, or tomorrow.
The last version of the Netscape browser before AOL killed it had this feature, but they never released it as an addon back to the general purpose Firefox community.
Several other addons purported to give this feature, but I never got them to do so. I got lost trying to make the ones I tried do it.
I just found out today about Read It Later. It puts a little check mark on the location bar. When you click it, it saves it for later. When I want to start reading those pages, I can just click another button and they are opened up one by one, or even just use a keyboard shortcut for it. As I open them, I can either have them removed from my Read It Later list automatically, or make it a manual uncheck.
This is exactly what I wanted.