I think it would help immensely if when you moused over a newly highlighted word that you were presented with its gender, if applicable. For example, "sac" was highlighted. It showed me the definition: "bag / bag(ful) / sack". It would have been handy if it also mentioned that sac is a masculine verb, or perhaps prefaced the definitions with "un sac:"

Saves us trouble googling "sac french gender" or something similar, which we will inevitably do because we'd like to use it in a sentence ourselves but have to go figure out the gender first.