Avoid third-party "download managers" or unknown sites – they may bundle malware. If you need Firefox for modern browsing , download the current ESR version (115.x or newer) from mozilla.org/firefox/enterprise/ .
If you absolutely must run Firefox 52.0.2 ESR, – use it only on a disconnected VM or an air-gapped machine with no sensitive data. mozilla firefox 52.0.2 esr.exe download
Avoid third-party "download managers" or unknown sites – they may bundle malware. If you need Firefox for modern browsing , download the current ESR version (115.x or newer) from mozilla.org/firefox/enterprise/ .
If you absolutely must run Firefox 52.0.2 ESR, – use it only on a disconnected VM or an air-gapped machine with no sensitive data.