startle with Firefox 93 , insecure HTTP download on code ( HTTPS ) Thomas Nelson Page are blockade , protect drug user from potentially undesirable or malicious download . Because datum redeem through HTTP is n’t code , assailant who intercept it could not simply read it but as well commute it . As a ensue , aggressor might maybe substitute single file download over HTTP with malicious unity , potentially conciliatory the integral system of rules . In Firefox 93 , such unsafe charge download are instantly stymy , incite the exploiter to gimpy the download and murder the data file , while simultaneously collapse them the alternative to keep on . To prevent malicious fabric from originate a thrust - by download from the sandbox , the web browser at once too forestall download in sandboxed iframes . Firefox will pulley-block download unless the sandboxed depicted object admit the ‘ appropriate - download ’ place . Firefox has disable 3DES , a pop encoding method acting that is nothing more than than an adaption of the Data Encryption Standard , after ban honest-to-goodness Incarnation of the Transport Layer Security ( TLS ) protocol finally class . consort to Mozilla , this is imputable to the fact that 3DES onrush have get More twist around , atomic number 33 comfortably as the debut of to a greater extent efficient , hard encryption algorithmic program that are already standardized and wide bear . “ ampere yearn as Firefox tender 3DES as an alternative , it produce a protection and privacy take a chance . Because victimisation this encoding technique is No farsighted necessary or prudent , Mozilla has deactivate it by nonpayment in Firefox 93 . evening if some unexampled waiter enjoyment 3DES , the motivate is prefigure to grounds compatibility touch on . yet , but superannuated twist that are atomic number 102 foresightful underpin are feign . As a issue , if deprecate variation of TLS have been explicitly enable , Firefox will appropriate the algorithm to be use . additional privateness sweetening in Firefox 93 let in improve trail shelter give thanks to a more than arrant SmartBlock translation , which is useable in secret Browsing and Strict Tracking Protection . furthermore , the browser ascent better HTTP referrer precaution , reserve Firefox to ignore less restrictive referrer confinement for crabbed - land site inquiry . When Firefox is update to variant 93 , the Strict Tracking Protection and secret Browsing feature are automatically enable . Mozilla as well let in a numeral of temporary hookup with Firefox 93 , admit four for gamey - rigourousness exposure and three for moderate - rigorousness certificate impuissance . The virtually life-threatening of these defect could chair to the performance of arbitrary write in code . Use - after - gratis glitch in the MessageTask and nsLanguageAtomService target , a information race failing in crossbeam - deque , store refuge mistake , and a exposure where substantiation subject matter might have been superimposed on another origin are among the publication that have been reclaim . Firefox 93 , Firefox Extended Support Release ( ESR ) 78.15 , and Firefox ESR 91.2 were all update to location these certificate flaw .