fix some cases where reading meta-data failed

WebExtension/contentscript.js

@@ -387,8 +387,10 @@
 
  context.debug(' *** fetchMode: ' + imgrequest.fetchMode + ' ***');
 
+ const pageHostname = (new URL(imgrequest.baseURI))?.hostname; // TODO ideally check against window.location instead of Node.baseURI ?!?
+ const imgHostname = (new URL(imgrequest.imageURL))?.hostname;
  if ( imgrequest.fetchMode === 'devFrontendFetch' ||
- imgrequest.fetchMode === 'devAutoFetch' && (propertiesObj.URL.startsWith('blob:') || propertiesObj.URL.startsWith('file:')) ) { // Do frontend fetch...
+ imgrequest.fetchMode === 'devAutoFetch' && ((pageHostname === imgHostname) || propertiesObj.URL.startsWith('data:') || propertiesObj.URL.startsWith('blob:') || propertiesObj.URL.startsWith('file:')) ) { // Do frontend fetch...
  if (imgrequest.fetchMode !== 'devAutoFetch') {
  console.warn(`xIFr: Forced FRONTEND fetch (${imgrequest.fetchMode})`);
  }
@@ -542,7 +544,7 @@
  image.srcset = candidate.srcset;
  image.crossOrigin = candidate.crossOrigin;
  image.referrerPolicy = candidate.referrerPolicy; // https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement
- image.baseURI = candidate.baseURI;
+ image.baseURI = candidate.baseURI; // base URL of the document containing the node (might be set by <base>)
  image.x = candidate.x;
  image.y = candidate.y;