There are multiple ways to change the default PDF viewer in Windows. In some cases, it could also be that Windows has set Firefox as the default PDF viewer. You can change that to a viewer other than Firefox. If you go to the Firefox settings and scroll down to the '''Applications''' section, you should see PDF (or Portable Document File) listed there along with the default action for that file. My guess is that your default PDF reader is set to Firefox, in which case the PDF would open in Firefox and PDF files would show a Firefox icon. Read this answer in context 👍 0 All Replies (6)īased on the fact that you can open these files with Adobe Acrobat still, that would mean that these are indeed still PDF files, not HTML files. If all else fails, this Windows support page explains how to manually change the default program for a file type. That should either change it as the default or open steps on how to change the default.
At the very bottom of the general section, there should be a button that says Select As Default PDF Handler. From the left side of that preferences window, select General. Then pick Preferences from that drop-down menu.
If that doesn't work, open Adobe Acrobat and select Edit from the top menu bar.
Admittedly, it's been a while since I've used Windows 7, but that should work. button on that window and select Acrobat as the reader and that should set the default reader back to Acrobat. That means that the file is still a PDF file, but that Firefox is just the default reader in Windows. On that window, the type of file will be "Firefox HTML Document (.pdf)". If you right click on the PDF file that's saved on your computer outside of Firefox, select Properties.
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