Describe the bug
Adding in long amounts of text pushes the whole editor off the edge of the page.

To Reproduce
Steps to reproduce the behavior:
Expected behavior
Content should wrap
_macOS Sierra 10.12.1
Firefox Quantum 61.0.1 (64-bit)
Gutenberg 3.2.0_
Tested and confirmed using WordPress 4.9.7 and Gutenberg 3.2.0 on Firefox 61.0.1 on macOS 10.13.5.

This also breaks the front-end as well and causes horizontal scrolling.

You need to add word-break: break-all; on .wp-block-column
Testing this on 3.9 - I think the back-end issue here has been resolved somewhere along the line.

The front end issue however has not been resolved.

I can still reproduce this issue in master. (Tested in Firefox Beta.)

Can confirm, yep, this is still an issue on the front-end and back-end.
Back-end vid: https://cl.ly/c7e79cefe9c6
Front-end vid: https://cl.ly/bbc80ba11159
@eddhurst Not sure why you would do word-break: break-word;. The allowable values for word-break are normal | keep-all | break-all.
https://www.w3.org/TR/css-text-3/#word-break-property
@maddisondesigns That is true, but word-break: break-all; is definitely not the expected behaviour of text within a column - and aggressively breaks words, even if they would otherwise wrap.
break-word is unofficial, but supported by Chrome, Safari and other WebKit/Blink browsers: https://caniuse.com/#search=word-break
Edit - strike that, I stupidly thought Firefox was in that list as well, sorry about that. The issue with break-all is that is ends up looking like this:
break-word

break-all

I have updated the initial PR, which correctly fixes this issue. I realised that word-break: break-word is effectively just treated as word-wrap: break-word
word-wrap has much better browser support and is understood by FF, IE and Edge.
This appears to have been fixed in the last few updates to columns
I replied to your forum post with the results of a test I ran.