Pure HTML document apparently has some JavaScript running in the background in Firefox











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I had to make asimple Pure HTML Document with no CSS and no JavaScript, to see how some Unicode Characters look like.



While viewing this Document in Mozilla FireFox, it showed the Unicode Characters and I left the tab open for a long time. When FireFox was overloaded by too many tabs, it showed a popup that this particular tab was hung:




Warning: Unresponsive script




Details were:




A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.




Now, my Document did not have any script tag, so I was surprised to see this popup on this tab. Even more surprising was the Script Path shown in the popup:




Script: resource://activity-stream/vendor/react-dom.js:188




Path seems to be seems to be internal to FireFox.



I tried to access this Path and resource://activity-stream/vendor/ and resource://activity-stream/; there seems to be a lot of content.



Is this expected behavior? Why did FireFox include a script in my pure HTML document?










share|improve this question




























    up vote
    2
    down vote

    favorite












    I had to make asimple Pure HTML Document with no CSS and no JavaScript, to see how some Unicode Characters look like.



    While viewing this Document in Mozilla FireFox, it showed the Unicode Characters and I left the tab open for a long time. When FireFox was overloaded by too many tabs, it showed a popup that this particular tab was hung:




    Warning: Unresponsive script




    Details were:




    A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.




    Now, my Document did not have any script tag, so I was surprised to see this popup on this tab. Even more surprising was the Script Path shown in the popup:




    Script: resource://activity-stream/vendor/react-dom.js:188




    Path seems to be seems to be internal to FireFox.



    I tried to access this Path and resource://activity-stream/vendor/ and resource://activity-stream/; there seems to be a lot of content.



    Is this expected behavior? Why did FireFox include a script in my pure HTML document?










    share|improve this question


























      up vote
      2
      down vote

      favorite









      up vote
      2
      down vote

      favorite











      I had to make asimple Pure HTML Document with no CSS and no JavaScript, to see how some Unicode Characters look like.



      While viewing this Document in Mozilla FireFox, it showed the Unicode Characters and I left the tab open for a long time. When FireFox was overloaded by too many tabs, it showed a popup that this particular tab was hung:




      Warning: Unresponsive script




      Details were:




      A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.




      Now, my Document did not have any script tag, so I was surprised to see this popup on this tab. Even more surprising was the Script Path shown in the popup:




      Script: resource://activity-stream/vendor/react-dom.js:188




      Path seems to be seems to be internal to FireFox.



      I tried to access this Path and resource://activity-stream/vendor/ and resource://activity-stream/; there seems to be a lot of content.



      Is this expected behavior? Why did FireFox include a script in my pure HTML document?










      share|improve this question















      I had to make asimple Pure HTML Document with no CSS and no JavaScript, to see how some Unicode Characters look like.



      While viewing this Document in Mozilla FireFox, it showed the Unicode Characters and I left the tab open for a long time. When FireFox was overloaded by too many tabs, it showed a popup that this particular tab was hung:




      Warning: Unresponsive script




      Details were:




      A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.




      Now, my Document did not have any script tag, so I was surprised to see this popup on this tab. Even more surprising was the Script Path shown in the popup:




      Script: resource://activity-stream/vendor/react-dom.js:188




      Path seems to be seems to be internal to FireFox.



      I tried to access this Path and resource://activity-stream/vendor/ and resource://activity-stream/; there seems to be a lot of content.



      Is this expected behavior? Why did FireFox include a script in my pure HTML document?







      firefox html javascript






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      edited Nov 29 at 15:31









      JakeGould

      30.9k1093137




      30.9k1093137










      asked Nov 29 at 15:24









      Prem

      1541111




      1541111






















          1 Answer
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          2
          down vote



          accepted










          Do you have any plugins installed in Firefox? Many times plugins and add-ons would make a call like that.



          Doing a basic Google search for resource://activity-stream makes me believe it’s this add-on for Firefox called Activity Stream.




          This system add-on replaces the new tab page in Firefox with a new design and functionality as part of the Activity Stream project.







          share|improve this answer

















          • 1




            +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
            – Prem
            Nov 29 at 16:24











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          1 Answer
          1






          active

          oldest

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          active

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          active

          oldest

          votes








          up vote
          2
          down vote



          accepted










          Do you have any plugins installed in Firefox? Many times plugins and add-ons would make a call like that.



          Doing a basic Google search for resource://activity-stream makes me believe it’s this add-on for Firefox called Activity Stream.




          This system add-on replaces the new tab page in Firefox with a new design and functionality as part of the Activity Stream project.







          share|improve this answer

















          • 1




            +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
            – Prem
            Nov 29 at 16:24















          up vote
          2
          down vote



          accepted










          Do you have any plugins installed in Firefox? Many times plugins and add-ons would make a call like that.



          Doing a basic Google search for resource://activity-stream makes me believe it’s this add-on for Firefox called Activity Stream.




          This system add-on replaces the new tab page in Firefox with a new design and functionality as part of the Activity Stream project.







          share|improve this answer

















          • 1




            +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
            – Prem
            Nov 29 at 16:24













          up vote
          2
          down vote



          accepted







          up vote
          2
          down vote



          accepted






          Do you have any plugins installed in Firefox? Many times plugins and add-ons would make a call like that.



          Doing a basic Google search for resource://activity-stream makes me believe it’s this add-on for Firefox called Activity Stream.




          This system add-on replaces the new tab page in Firefox with a new design and functionality as part of the Activity Stream project.







          share|improve this answer












          Do you have any plugins installed in Firefox? Many times plugins and add-ons would make a call like that.



          Doing a basic Google search for resource://activity-stream makes me believe it’s this add-on for Firefox called Activity Stream.




          This system add-on replaces the new tab page in Firefox with a new design and functionality as part of the Activity Stream project.








          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 29 at 15:35









          JakeGould

          30.9k1093137




          30.9k1093137








          • 1




            +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
            – Prem
            Nov 29 at 16:24














          • 1




            +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
            – Prem
            Nov 29 at 16:24








          1




          1




          +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
          – Prem
          Nov 29 at 16:24




          +1 , Somehow, my SuperUser Inbox showed 2 new messages, which I assumed was for the "question edit" and the "comment" ; I seem to have missed your answer ! Also, this is a system addon which means it is an integral part ; Probably we can not disable that.
          – Prem
          Nov 29 at 16:24


















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