Use `remove`, rather than `removeChild`, when removing the temporary `Text` nodes used in `FirefoxCom`
Use `remove`, rather than `removeChild`, when removing the temporary `Text` nodes used in `FirefoxCom`

This is the "modern" way of removing a node from the DOM, which has the benefit of being a lot shorter and more concise.

Also, this patch removes the `return` statement from the "pdf.js.response" event listener, since it's always `undefined`, given that none of the `callback`-functions used here ever return anything (and don't need to either). Generally speaking, returning a value from an event listener isn't normally necessary either.

Shoobx/pdf.js,caremerge/pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,nawawi/pdf.js,nawawi/pdf.js,Snuffleupagus/pdf.js,showpad/mozilla-pdf.js,timvandermeij/pdf.js,mozilla/pdf.js,xavier114fch/pdf.js,showpad/mozilla-pdf.js,Snuffleupagus/pdf.js,Shoobx/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,mozilla/pdf.js,Snuffleupagus/pdf.js,caremerge/pdf.js,xavier114fch/pdf.js,macroplant/pdf.js,mozilla/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js