When I try to open an PDF file in the Firefox browser, the file reconizes a HTML file instead of PDF.

See question. The Adobe plugin is installed. It looks like Firefox attaches html to the file name.
I click on link on internet. A screen appears that says:
You have chosen to open (filename*.pdf) The icon for the file name shows an Internet Explorer icon. The it says: which is a: Acrobat Reader file. What should Firefox do with this file, you have two options: Open WIth and save file.

" Help > Troubleshooting Information > Profile Directory: Open Containing Folder" . i can't find open containing folder in profile directory. it does give me the option to open the places.sqlite file using graphic converter. when i try that, graphic converter gives me a window saying that it can't be opened because it is corrupted or is not a file type supported by graphic converter.
i appreciate your help with a workaround to get the old bookmarks. that works. however, the problem has morphed from that concern to why adobe reader [the default app.] won't open firefox .sqlite files. is the problem in adobe reader or firefox? also, how can i tell if the places.sqlite file is corrupt?
i'm getting in over my head here and do appreciate your help.

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== This happened ==
Every time Firefox opened
== This past week

Hello David.
It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
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See "Hang at exit":
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* https://support.mozilla.com/kb/Firefox+hangs

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tt2

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[email address removed to protect your privacy and security]
<! [email protected] -->

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See "Hang at exit":
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*https://support.mozilla.com/kb/Firefox+hangs

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but meantime, see an archive.org capture from Januuary 5 : Wisconsin Wildlife Federation

When I try to open an PDF file in the Firefox browser, the file reconizes a HTML file instead of PDF.

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