How can I make Firefox word-wrap text/plain files?

Question

When I view this IRC log in Firefox, long lines do not wrap. But I wish they would! Anyone know how to make Firefox word-wrap text/plain files?

• this file is served as gzipped plain text; try HEAD http://ci.mifos.org/irclogs/%23mifos/archive/2010/2010-01-04.log.gz and you should see Content-Type: text/plain
• when the same resource is viewed in Google Chrome, long lines wrap
• this might be a related question on doctype, but the "accepted answer" contains a broken link
• this didn't work for me (even the alternate version using pre-wrap as opposed to -moz-pre-wrap mentioned in a comment by user "Idran")
• using "View → Page Source", then toggling word wrap is a suitable workaround

Answer 1

The Toggle Word Wrap Firefox extension might work for you.

Answer 2

FF 31. Open a new tab.

Enter about:config in the Awesome Bar.

Search for view_source.wrap_long_lines and set value to true.

Answer 3

If you just need to wrap plaintext files, try Ctrl-U (then View -> Wrap Long Lines, if not already checked). This solution is cleaner than an add-in with plaintext files, but sloppier with text embedded in html.

Answer 4

Go to the Firefox User Profile.

This is for applying a style to all web pages you view.

Firefox User Profile Folder --> Chrome -- > userContent.css (If this file is not present, make a copy of userContent-example.css and rename it!

/*
 * This file can be used to apply a style to all web pages you view
 * Rules without !important are overruled by author rules if the
 * author sets any.  Rules with !important overrule author rules.
 */

This is for customizing Mozilla's user interface.

Firefox User Profile Folder --> Chrome -- > userChrome.css (If this file is not present, make a copy of userChrome-example.css and rename it!

/*
 * This file can be used to customize the look of Mozilla's user interface
 * You should consider using !important on rules which you want to
 * override default settings.
 */

Add to the bottom:

pre { white-space: pre-wrap !important; }

Save the file.]

Restart Firefox. Works with Firefox 26.

Answer 5

This answer is inspired by @Travis's answer.

If you just need to wrap plain text files, then on the menu bar click View → Page Style → Wrap Long Lines. This solution is cleaner than an add-on for plain text files, but sloppier with text embedded in HTML.

Answer 6

Here is an untested possibility, but the ideal solution if using view-source:URL with [View] [wrap long lines] enabled. This would be for the text/plain mime type to automatically use:

view-source: schema

This avoids the ctrl-u or menu [page source] click and reduces manual labour in an automated computing environment.

Answer 7

For what it's worth, Firefox 22 (the current target as of this writing) will introduce a new feature to allow wrapping text files directly in the browser. See improved plain-text handling in Firefox for a preview, and Firefox bug 253564 for the gory details.