So when there are multiple imports in a stylesheet, Firefox won’t apply any CSS rules until all of the imports are processed. I’ll explain the differences on a few simple examples.įirst of all, Firefox processes stylesheets synchronously. The method from previous paragraph doesn’t work in Firefox at all because of significant differences in processing of stylesheets in comparison to Chrome. The technique works because Chrome processes imports asynchronously, so when any import stops blocking, Chrome immediately parses it and applies it. When the leak of the 2nd character reaches the ATTACKER-SERVER, the 3rd import stop blocking… and so on.When the leak of the 1st character reaches the ATTACKER-SERVER, the 2nd import stops blocking and returns a stylesheet that includes the 1st character and attempts to leak the 2nd one,.The first returns a stylesheet that leaks the 1st character of the token,.In the beginning only the first returns a stylesheet the other ones just block the connection,.
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