Mozilla Firefox 53.0 Final
https://www.mozilla.org/en-US/firefox/53.0/releasenotes/
Download Page | All Languages and OS
https://www.mozilla.org/en-US/firefox/all/
En-US
x86
https://download-installer.cdn.mozilla.net/pub/firefox/releases/53.0/win32/en-US/Firefox%20Setup%2053.0.exe
x64
https://download-installer.cdn.mozilla.net/pub/firefox/releases/53.0/win64/en-US/Firefox%20Setup%2053.0.exe
Mozilla Firefox 52.1.0 ESR
All Languages and OS:
https://www.mozilla.org/en-US/organizations/all/
FTP links:
https://ftp.mozilla.org/pub/firefox/releases/52.1.0esr/
En-US
x86
https://download.mozilla.org/?product=firefox-52.1.0esr-SSL&os=win&lang=en-US
x64
https://download.mozilla.org/?product=firefox-52.1.0esr-SSL&os=win64&lang=en-US
Mozilla Firefox 45.9.0 ESR
En-US
x86
https://download.mozilla.org/?product=firefox-45.9.0esr-SSL&os=win&lang=en-US
x64
https://download.mozilla.org/?product=firefox-45.9.0esr-SSL&os=win64&lang=en-US
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