Display a Mozilla Firefox user.js settings file contents in your Firefox browser, with:

• highlighting, links, themes*, re-size, wrap, about:config links/regex/groups
• expanding sections, and index to go to sections (with compatible user.js projects)
• compare preferences in two user.js, in a table format with order/layout options and bold cell border around differences
• actions including: user-overrides.js* append* (with comment-out*), point and click overrides collector, skeleton, prefs.js cleaner*, group by values
• load/save, drag/drop, or copy/paste user.js files (can load from some on-line URLs too)
• functions for find (filter/list)/reset/set on about:config Web Console (Firefox/forks/Thunderbird/SeaMonkey)
• single .html file (HTML/CSS/JavaScript) with no external dependency
• open userjs-tool.html on-line or save for off-line use

(*arkenfox/user.js inspired. Please visit arkenfox/user.js and read their info on arkenfox/user.js/wiki. They also have nice scripts for append/clean/troubleshoot.)

This started as an over the top experiment for learning some HTML/CSS/JavaScript (first released 2019年01月02日, compare added 2020年02月22日). This is a viewer/tool, and not an editor/installer.

Disclaimer: Use with care at your own risk, and verify any results

• Open the raw text/html file in a browser tab
• Right click within that page and "Save Page As..."
• Open the saved userjs-tool.html file with your Firefox browser
  (you can drag and drop it from your Downloads folder into a new tab)
• Bookmark it for easy access
• Remember to check here for updates

• (Optional) The userjs-tool-themes.css file can be used with userjs-tool.html to add custom themes/colors (or override the default)

• The userjs-tool-aboutconfig-functions.js file is also embeded in userjs-tool.html (view with the [a:c Functions] button).

• You can do these (and more) from the interface, or by using URL parameters:

  • View the current arkenfox user.js (github.io)

  • View the current arkenfox user.js in a table (github.io)

  • Load and view a user.js URL: https://icpantsparti.github.io/firefox-user.js-tool/userjs-tool.html?action=view1&load1=%68ttps://raw.githubusercontent.com/arkenfox/user.js/master/user.js