[tor-bugs] #21270 [Applications/Tor Browser]: TBB noscript settings break WebExtensions addons

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#21270: TBB noscript settings break WebExtensions addons
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 Reporter:  replaythesong                       |          Owner:  tbb-team
     Type:  defect                              |         Status:  new
 Priority:  Medium                              |      Milestone:
Component:  Applications/Tor Browser            |        Version:
 Severity:  Normal                              |     Resolution:
 Keywords:  tbb-usability, tbb-security-slider  |  Actual Points:
Parent ID:                                      |         Points:
 Reviewer:                                      |        Sponsor:
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Comment (by replaythesong):

 In TBB 6.5, security slider has 3 settings instead of 4. Bug occurs in
 medium or high, but not in low.

 So, in steps to reproduce, replace 'medium-low' with 'low' and replace
 'medium-high' with 'medium'.

 An aside: in 6.5, when moz-extension: is added so that the script does
 finally run in medium (or high), it is now accompanied by an error in
 noscript/DOM.js:
 {{{
 NS_NOINTERFACE: Component returned failure code: 0x80004002
 (NS_NOINTERFACE) [nsIInterfaceRequestor.getInterface]
 }}}
 This error does not appear to prevent the script running. It does not
 appear at all in 'low' security mode.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21270#comment:3>
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