Fix the following error in lib/background.js:

[doronbehar]

Fixes #58, #57, #62 which are all the same.

[doronbehar]

Hey @sarahavilov , Could you please take a look at these? I'd love to spare myself from creating a fork and use it instead.

I'd like to note in this regard that I could not find any alternative at the addons' store which was as extensible / configurable as yours and so beautifully designed (from the technical point of view). So I really see no other choice then hoping to hear back from you! This PR is super simple but I hope we'll see a new release after it because without this fix the extension is useless :)

Thanks!

[reubot]

I'd like to note in this regard that I could not find any alternative at the addons' store which was as extensible / configurable as yours

Have tried https://addons.mozilla.org/en-US/firefox/addon/autofill-quantum/ ?

[doronbehar]

This addon certainly seems good but this one is free software, while the other doesn't seem to be - I couldn't find the source code.

I guess I'll just use my own version of this addon as @sarahavilov seems unavailable..