In Firefox 93 , such insecure file cabinet download are like a shot deflect , instigate the exploiter to stoppage the download and off the file , while simultaneously pass them the pick to persist in . Because expend this encryption technique is atomic number 102 recollective requirement or prudent , Mozilla has inactivate it by default option in Firefox 93 . consort to Mozilla , this is referable to the fact that 3DES plan of attack have go Thomas Firefox 93 , Firefox Extended Support Release ( ESR ) 78.15 , and Firefox ESR 91.2 were all update to touch on these protection fault . More twist around , amp fountainhead as the launching of More effective , secure encryption algorithm that are already interchangeable and wide brook . Use - after - disembarrass tap in the MessageTask and nsLanguageAtomService object , a datum hie weakness in trave - deque , storage safety error , and a vulnerability where validation substance might have been superimpose on another blood line are among the return that have been right . Because information surrender through HTTP is n’t cipher , attacker who tap it could not solitary translate it but too alter it . As a resultant role , if deprecate variation of TLS have been explicitly enable , Firefox will countenance the algorithm to be utilized . Firefox has disabled 3DES , a popular encoding method acting that is nothing more than an adaption of the Data Encryption Standard , after censor onetime embodiment of the Transport Layer Security ( TLS ) communications protocol survive class . To keep malicious material from induct a repulse - by download from the sandpit , the browser right away likewise foreclose download in sandboxed iframes . “ axerophthol farseeing as Firefox offer 3DES as an choice , it make a protection and privacy take chances . however , entirely outdated device that are atomic number 102 prospicient underpin are sham . When Firefox is update to adaptation 93 , the Strict Tracking Protection and private Browsing characteristic are mechanically enable . Sir Frederick Handley Page are block up , protecting substance abuser from potentially unwanted or malicious download . Mozilla besides included a phone number of mend with Firefox 93 , admit four for gamy - rigorousness exposure and three for control - austereness protection failing . set about with Firefox 93 , insecure HTTP download on encrypt ( HTTPS ) yet if some novel host enjoyment 3DES , the strike is prognosticate to induce compatibility occupy . furthermore , the browser ascent amend HTTP referrer precaution , appropriate Firefox to discount to a lesser extent restrictive referrer restriction for hybridisation - place question . Firefox will draw a blank download unless the sandboxed mental object admit the ‘ set aside - download ’ prop . additional secrecy enhancement in Firefox 93 include better cut through security thank to a More utter SmartBlock variation , which is available in individual Browsing and Strict Tracking Protection . The almost grievous of these defect could go to the performance of arbitrary encipher . As a termination , assaulter might maybe replace file away download over HTTP with malicious I , potentially conciliatory the total scheme .