Firefox semi-technical question.

Sort of technical question. I'm pretty sure that it was somebody, or multiple somebodies, here who steered me to a couple of very handy Firefox add-ons: Dog Ears and Readability.

Dog Ears especially has proved very handy to me, since I do almost all reading through the web browser these days. However, it's author has left the realm and the last version of Firefox supported for the addon was 4.x.
Now the Mozilla folks have decided to change their latest version to be 6.x.x and thus my handiest addon is broken.
So my question, has anyone found a decent addon that lets one mark a particular point in a story like Dog Ears, but that is still compatible with newer versions of Firefox? Or with any other browser for that matter, since I've got most of the major players installed.

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