Monstrous meaning "large and unwieldy". Yes, Mojo::DOM is well documented and no doubt a high-quality module, but there are so many method calls, it's difficult to sort through them. This slows you down.
I don't know if I said this was "something simple" but it is a problem that seems to common enough to have been solved my another module, especially in Perl that grew its legs during the dawn of the www. Pulling up a web page in a browser is an extraordinarily difficult task when you look under the hood but it should be simple to perform. I would have expected a basic task like this to be readily available in an off-the-shelf module. Indeed, there are existing modules but they were either a) buggy or b) didn't meet my specific needs.