Zamijenjena datoteka:Firefox_71_running_on_Fedora_Linux_and_GNOME_Shell.png sa datotekom:Firefox_71_running_on_Linux_and_GNOME_Shell.png (od strane CommonsDelinker razlog: File renamed: uploader request).
* Windows: 3653 [[Megabajt|MB]]<ref>{{cite web |url=https://download.mozilla.org/?product=firefox-latest&os=win64&lang=en-US |title=Latest Firefox Windows installer |publisher=Mozilla |date=3123. 129. 20152020 |accessdate=3123. 129. 20152020}}</ref><ref>{{cite web |url=http://www.linexp.ru/firefox-from-1-to-20-javascript-benchmark-and-distribution-size |title=History of FireFox distribution size |publisher=Linexp.ru |date=23. 3. 2013 |accessdate=1. 7. 2013 |archiveurl=https://web.archive.org/web/20130515184056/http://www.linexp.ru/firefox-from-1-to-20-javascript-benchmark-and-distribution-size |archivedate=15. 5. 2013}}</ref>
* macOS: 5172,9 MB<ref>{{cite web |url=https://download.mozilla.org/?product=firefox-latest&os=osx&lang=en-US |title=Latest Firefox OS X installer |publisher=Mozilla |date=3123. 129. 20152020 |accessdate=3123. 129. 20152020}}</ref>
* Linux: 5168,9 MB<ref>{{cite web |url=https://download.mozilla.org/?product=firefox-latest&os=linux64&lang=en-US |title=Latest Firefox Linux installer |publisher=Mozilla |date=3123. 129. 20152020 |accessdate=3123. 129. 20152020}}</ref>
* Android: 31 MB<ref name=GooglePlay>{{cite web |url=https://play.google.com/store/apps/details?id=org.mozilla.firefox |title=Firefox for Android on Google Play |accessdate= 19. 11. 2012}}</ref>
