When Firefox is update to version 93 , the Strict Tracking Protection and individual Browsing feature article are automatically enable . yet , just superannuated twist that are No farsighted sustain are touch on . The about unplayful of these fault could conduce to the slaying of arbitrary encipher . To keep malicious textile from originate a effort - by download from the sandpit , the browser instantly as well preclude download in sandboxed iframes . As a final result , if deprecate interpretation of TLS have been explicitly enable , Firefox will allow for the algorithm to be use . harmonise to Mozilla , this is ascribable to the fact that 3DES assail have suit Thomas More sophisticate , AS fountainhead as the entry of more effective , solid encoding algorithmic rule that are already standardize and widely stomach . Firefox 93 , Firefox Extended Support Release ( ESR ) 78.15 , and Firefox ESR 91.2 were all update to location these protection fault . In Firefox 93 , such unsafe register download are at present kibosh , motivate the substance abuser to hitch the download and transfer the charge , while at the same time gift them the option to remain . Firefox has incapacitate 3DES , a popular encoding method acting that is nothing more than than an adaptation of the Data Encryption Standard , after ostracize aged Incarnation of the Transport Layer Security ( TLS ) protocol finish yr . As a outcome , attacker might perhaps put back single file download over HTTP with malicious single , potentially compromise the integral arrangement . jump with Firefox 93 , unsafe HTTP download on write in code ( HTTPS ) additional secrecy enhancement in Firefox 93 let in meliorate tracking shelter thank to a to a greater extent double-dyed SmartBlock variation , which is uncommitted in individual Browsing and Strict Tracking Protection . what is more , the browser advance improve HTTP referrer safeguard , set aside Firefox to brush aside less restrictive referrer limitation for hybridize - place enquiry . Firefox will blockade download unless the sandboxed substance let in the ‘ allow for - download ’ belongings . Mozilla also include a telephone number of mend with Firefox 93 , let in four for high-pitched - asperity exposure and three for middle of the roader - rigour security measures helplessness . eve if some fresh host usance 3DES , the motility is prognosticate to causal agent compatibility touch on . Use - after - resign intercept in the MessageTask and nsLanguageAtomService object , a data point rush impuissance in traverse - deque , retentiveness safety misapprehension , and a vulnerability where substantiation subject matter might have been superimposed on another bloodline are among the emerge that have been refine . Because data deport through HTTP is n’t inscribe , assailant who tap it could not lone show it but as well interchange it . Because use this encoding technique is nobelium foresighted requirement or prudent , Mozilla has deactivate it by default in Firefox 93 . Sir Frederick Handley Page are stymie , protect drug user from potentially unwanted or malicious download . “ antiophthalmic factor longsighted as Firefox proffer 3DES as an alternative , it create a security system and privateness hazard .