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How can I stop FireFox from changing my Adobe PDF's to FireFox HTML's???

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I was converting a MS word doc on my computer to an Adobe PDF and saving it on my computer. FireFox changes it to a FireFox HTML (I'm not not even using the Browser). While MS windows 7 lets me choose which way I want to view it (with Adobe or any browser), it is IMPOSSIBLE to post onto Facebook. FB is looking for a PDF and the file I converted to is something else. So now I can't post my PDF's because FireFox intrudes into my computer and changes things. HOW CAN THIS BE RECTIFIED? Can I stop FF from doing this?

I was converting a MS word doc on my computer to an Adobe PDF and saving it on my computer. FireFox changes it to a FireFox HTML (I'm not not even using the Browser). While MS windows 7 lets me choose which way I want to view it (with Adobe or any browser), it is IMPOSSIBLE to post onto Facebook. FB is looking for a PDF and the file I converted to is something else. So now I can't post my PDF's because FireFox intrudes into my computer and changes things. HOW CAN THIS BE RECTIFIED? Can I stop FF from doing this?

Solución elegida

A file like document.pdf should be the same file whether it is described as an Adobe Acrobat Document or a Firefox document, but the description changes depending on the default application for opening the file. Could you check on that? For Windows 7, see:

https://support.microsoft.com/en-us/windows/change-which-programs-windows-7-uses-by-default-62fd162f-8c82-0436-806f-c60d69dcf495

If you change your default application for PDFs to Adobe Acrobat, does working with PDFs go back to normal?

Does Firefox change it back the next time you run it?

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Solución elegida

A file like document.pdf should be the same file whether it is described as an Adobe Acrobat Document or a Firefox document, but the description changes depending on the default application for opening the file. Could you check on that? For Windows 7, see:

https://support.microsoft.com/en-us/windows/change-which-programs-windows-7-uses-by-default-62fd162f-8c82-0436-806f-c60d69dcf495

If you change your default application for PDFs to Adobe Acrobat, does working with PDFs go back to normal?

Does Firefox change it back the next time you run it?

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Thank you, jscher2000. You were absolutely right. It worked perfectly. Not only did your solution fix my current problem, it went back to ALL PDF's on my computer, and reverted them to Adobe PDF's. Unfortunately, I must have had a bit of brain gas to have forgotten to try that, before posting this question. Another thing I found out while doing this is that, Adobe Reader DC has a REPAIR selection. Pressing that recovered my Adobe picture thumb nails to reappear next to the file names, for those Adobe files w/pictures. Oh yes, FireFox does not affect my PDF's. I do not believe it was FireFox that was doing that from the beginning. My bad. Rather it was probably me that selected PDF's to be viewed by FF for some reason I no longer recall. Once again, thank you.

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Glad that worked, and good to know about the Repair.