I have an odd suggestion for learning more of vim: Check out gvim.

It's vim with a GUI, dropdowns for nice discoverability and most importantly the shortcuts on each menu item are the commands to use it in regular vim. It's how I found out vim even had folding waaay back.

For Firefox, I use Tridactyl. After Vimperator died I tried several replacements and found Vimium very limited (IIRC it was the one that was just hotkeys and didn't have modes like vim, no idea how it's grown since then). I have Tridactyl configured to open gvim with the contents of any text input when I hit ctrl+i so I can use vim for them.