Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)
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fx-statistics – Add-ons for Firefox
847223 - Don't decode images that aren't visible when we download them
MemChaser – Get this Extension for 🦊 Firefox (en-US)
Browser.cache.memory.enable - MozillaZine Knowledge Base
https://addons.mozilla.org/en-US/firefox/addon/11922
