To disable automatic updates you now have to do it though about:config :/

1. Enter about:config into the address bar,
2. Search for 'update'
3. Find app.update.auto
4. Double-click on that link to change true to false.

You can narrow your searches by starting them with:

They're easy to forget, but there's a little add-on you can use to remind yourself: location-bar-characters.

To tell websites that you prefer to view pages i ndark mode (or…)

1. about:config
2. Find ui.systemUsesDarkTheme
   • 0 = light
   • 1 = dark
   • 2 - no prefernce

If you want your UI to be themed you need to use a theme.

Reader View is a nice clean way to read stuff online. Makes a lot of news and writing sites actually tolerable. Strips out everything but the text and images. Especially great on mobile, as it will turn pages that aren't designed for a small screen into something comfortable to read in that format.

Some add-ons for enhancing reader view (that I'm yet to test ):

• Open in Reader View - right-click menu option.
• Automatic Reader View - Always open particular sites in reader view.
• Auto Reader View - 〃

As an alternative to add-ons like Stylus you can simply add CSS rules to the file userContent.css.

1. Open about:config and turn toolkit.legacyUserProfileCustomizations.stylesheets to True.
2. Open your profile directory (for me it's ~/.mozilla/[profile name]) and create a directory called chrome if it doesn't exist.
3. Inside chrome create a file called userContent.css
4. Added rules to this, enclosed within @-moz-document domain([url]) {} that references the site you wish to target.
   • Instead of domain([url]) you can use url, regex, etc. See: @document#Syntax.

@-moz-document domain(wiki.ryliejamesthomas.net) {
	body {
		background-color:red;
	}
}

Sometimes after a crash Firefox will start-up just fine, but pages won't load. Deleting ~/.cache/mozilla seems to fix it.

I ended up making an alias in my .bashrc:

alias fix-firefox='rm -rf ~/.cache/mozilla/firefox'

• mozilla/readability - Standalone version of the reader mode.