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Issue 7305 - Add about:blank frame to hierarchy for any request that refers to an unknown frame ID

This MR contains the following changes:

  • Updated updatePageFrameStructure() to fall back to using "about:blank" if no URL is passed
  • Updated ext.getFrame() to accept optional parent frame ID parameter to create frame if none exists
  • Pass parent frame ID to ext.getFrame() in request handler to ensure that requests are always associated with a frame

As mentioned here, it is unclear what effect this change has on trac#6565 since I'm unable to reproduce the issue described there that the following lines in lib/requestBlocker.js are taking care of.

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