I installed this. I have two comments:

The first time I launch Firefox after installing, the interfaces asks if I want to import my history or "cancel." I'd like to recommend changing the wording to "Do not import" or something. Did I just cancel out of a larger startup process? I assume not, but I don't think "cancel" is the logical opposite of "import history."

For the screencast, this is my recommendation: 1) write your script 2) record the video portion 3) narrate the video as a separate stage

I've made a few videos this way, and this is the best way I've found to make it fast and error-free. It's hard to multitask, and performing a task while vocalizing it at the same time is really hard.

Anyway, I'm really interested in this project...