GitHub - TarekJor/Firefox-52-ESR-legacy-addon: [WIP] A curated list and XPI files of Mozilla Firefox browser extensions, addons, themes from addons. mozilla.org, before XUL-based purge blackout
Mozilla Firefox 52 now available | Linux Addicts
Firefox 52 Update Shows You The Security Level - https.in Blog
Firefox 52 Released With WebAssembly Support, Removes NPAPI Plugins Other Than Flash (Java, Silverlight) ~ Web Upd8: Ubuntu / Linux blog