Word-wrap in Firefox

Open a new tab. Enter about:config. Search for wrap. You will find an entry to toggle word wrap on or off.

http://superuser.com/a/791320

Set Firefox to Allow 10 Simultaneous Downloads

about:config => network.http.max-persistent-connections-per-server
ref: http://mypchell.com/guides/17-set-firefox-to-allow-10-simultaneous-downloads

firefox: Using “unverified” add-ons

about:config => xpinstall.signatures.required => false

ref: https://support.mozilla.org/en-US/questions/1078339