tradeoff in the uMatrix default rules: third party frames are blocked but images/css are allowed

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The default rules for the uMatrix browser extension look something like this:



* * * block
* * css allow
* * frame block
* * image allow
* 1st-party * allow
* 1st-party frame allow


What's an example where you might want uMatrix to block a "3rd-party" frame, specifically? I assume it's not just that you want to block the text of the frame, because that would hardly be different from loading an image.



Does it imply that inside the context of a 3rd-party frame, uMatrix will treat most requests as "1st-party", and hence allow them by default? Or is the reason behind the default rules more subtle than that?



(I'm not very interested in the implications of Spectre in web browsers in this case. E.g. that was a completely unanticipated CPU bug, which I don't think was discovered at the time these defaults were set).




firefox




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    down vote

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    The default rules for the uMatrix browser extension look something like this:



    * * * block
    * * css allow
    * * frame block
    * * image allow
    * 1st-party * allow
    * 1st-party frame allow


    What's an example where you might want uMatrix to block a "3rd-party" frame, specifically? I assume it's not just that you want to block the text of the frame, because that would hardly be different from loading an image.



    Does it imply that inside the context of a 3rd-party frame, uMatrix will treat most requests as "1st-party", and hence allow them by default? Or is the reason behind the default rules more subtle than that?



    (I'm not very interested in the implications of Spectre in web browsers in this case. E.g. that was a completely unanticipated CPU bug, which I don't think was discovered at the time these defaults were set).




    firefox




    share|improve this question





















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      down vote

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      1









      up vote
      1
      down vote

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      The default rules for the uMatrix browser extension look something like this:



      * * * block
      * * css allow
      * * frame block
      * * image allow
      * 1st-party * allow
      * 1st-party frame allow


      What's an example where you might want uMatrix to block a "3rd-party" frame, specifically? I assume it's not just that you want to block the text of the frame, because that would hardly be different from loading an image.



      Does it imply that inside the context of a 3rd-party frame, uMatrix will treat most requests as "1st-party", and hence allow them by default? Or is the reason behind the default rules more subtle than that?



      (I'm not very interested in the implications of Spectre in web browsers in this case. E.g. that was a completely unanticipated CPU bug, which I don't think was discovered at the time these defaults were set).




      firefox




      share|improve this question











      The default rules for the uMatrix browser extension look something like this:



      * * * block
      * * css allow
      * * frame block
      * * image allow
      * 1st-party * allow
      * 1st-party frame allow


      What's an example where you might want uMatrix to block a "3rd-party" frame, specifically? I assume it's not just that you want to block the text of the frame, because that would hardly be different from loading an image.



      Does it imply that inside the context of a 3rd-party frame, uMatrix will treat most requests as "1st-party", and hence allow them by default? Or is the reason behind the default rules more subtle than that?



      (I'm not very interested in the implications of Spectre in web browsers in this case. E.g. that was a completely unanticipated CPU bug, which I don't think was discovered at the time these defaults were set).





      firefox





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      asked Apr 18 at 11:38









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