Firefox 69: userChrome.css and userContent.css disabled by default

Mozilla plans to land a change in Firefox 69 that disables the loading of userChrome.css and userContent.css by default to enhance efficiency.

The information userChrome.css and userContent.css are used to switch content material of webpages or the browser itself utilizing CSS directions.

The choice to take action isn’t eliminated however Mozilla plans to make it opt-in as a substitute of opt-out. The group states that not having to search for the 2 information on startup improves the start-up efficiency of the Firefox browser.

Firefox customers who use the information already may have the function enabled for them robotically to keep away from disruptions to their workflows or expectations.

The desire must be flipped to True on new installations solely beginning with the discharge of Firefox 69.

Tip: check out customizing Firefox with userchrome.css.

Timeline for the change (proposed, topic to alter):

  • Firefox 68: Firefox checks if userChrome.css or userContent.css exist. If sure, desire will likely be set to True to permit the loading of those information on browser begin. If no, desire stays set to False (do not look).
  • Firefox 69: new installations is not going to assist userChrome.css and userContent.css by default until desire is ready by the consumer.

The Preference that determines the state

firefox toolkit.legacyUserProfileCustomizations.stylesheets

The desire in query is toolkit.legacyUserProfileCustomizations.stylesheets. Here is how you modify its worth:

  1. Load about:config within the Firefox handle bar.
  2. Confirm that you may be cautious.
  3. Search for toolkit.legacyUserProfileCustomizations.stylesheets utilizing the search on the high.
  4. Toggle the desire. True means Firefox helps the CSS information, False that it ignores them.

Closing Words

Options to load userChrome.css and userContent.css will not go away however customers have to be conscious that they could want to alter the desire to permit the loading of those information from Firefox 69 onward.

The group introduced no plans to retire the choice sooner or later

Mozilla landed the User Scripts WebExtensions API recently in Firefox, nevertheless it seems unrelated to the change.

Now You: Do you utilize these information in Firefox?

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