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A comment on Embedded PDF viewer in Firefox 81 supports filling forms. Parent comment

Re:Embedded PDF viewer in Firefox 81 supports filling forms by ocdtrekkie on Tuesday September 22, 2020 @11:37AM (#24555750)
If Chrome doesn't use pdf.js, then neither would Edge, which is a Chrome fork. My original comment may have been mistaken.
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Re:Embedded PDF viewer in Firefox 81 supports filling forms by oefrha on Tuesday September 22, 2020 @12:19PM (#24556358)
A Chromium fork could replace certain components if they so choose. The PDF rendering component would be one of the easier ones to replace.

However, I was able to confirm that Edge uses extension ID mhjfbmdgcfjbbpaeojofohoefgiehjai to render PDF internally[1], same as Chrome, so indeed it's using PDFium.

[1] The rendered PDF element would look like

  <embed id="plugin" type="application/x-google-chrome-pdf" src="..." stream-url="chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/..." headers="..." ...>
And here's the extension's manifest in Chromium source, where you can find the extension ID: https://github.com/chromium/chromium/blob/2baa2b094cdd60e980...
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