Analysis of information sources in references of the Wikipedia article "Features of Firefox" in English language version.
[...] Firefox's own user interface is implemented using the same underlying code that displays web pages and handles their interactions. A set of packages known as chrome describe the interfrace's structure and style, and include JavaScript to bring it to life. [...] JavaScript code used in chrome can read and write preference files, bookmark tables, and ordinary user files - privileges that would never be granted to code downloaded from a web page.
From Firefox 47 onwards, 3D view is no longer available.
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