September 2017
DEV - Web developer guides | MDN
Web developer guides.
These articles provide how-to information to help you make use of specific technologies and APIs.
January 2017
FIREFOX - DEV - BROWSER TOOLBOX - change color of firefox bookmarks menu - forum.userstyles.org
you can use Firefox menu->Developer->BrowserToolbox to examine UI elements and play with CSS. After you open it, click OK in the main browser window, wait a few seconds for the toolbox to initiliaze, then use the first button in its toolbar to pick an element (bookmarks button in your case).
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