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The Chrome extension activates PDF.js by inserting the script tags in a document whose URL and location origin is identical to the PDF file. Because of this, the path './images/' was resolved relatively to the location of the PDF file instead of the extension. To fix this, the IMAGE_DIR constant is moved outside the local scope, to allow extensions/chrome/insertviewer.js to override the value. Originally, the IMAGE_DIR variable was a global variable, but commit f8f4b3f45dc6ff5f5b2572b5387389db33616be3 moved the global variable to the local scope, causing the extension to malfunction. Impact: low, the only consequence is that some rarely used images were not visible. Trivial test: At the center of page 2, the annotation icon (images/annotation-comment.svg) should be visible: http://linorg.usp.br/CTAN/macros/latex/contrib/pdfcomment/doc/pdfcomment.pdf
