Avast Free just flagged 2 Firefox 39 dll files

Avast Free Antivirus / Premium Security
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I started up Firefox this morning and Avast sent 2 files to the quarantine chest. One was FirefoxCtype.dll (flagged as win32:BHO-AOG trojan), and npFirefoxplugin.dll (flagged as win32:Conduit-O trojan). Firefox seems to be running ok afterwards. Has this happened to anyone else?

I have FF auto updates off so I’m still on 39 (and from the posts I saw about 40 and the upcoming 41 on here I’m glad I haven’t upgraded yet).

Edit: I can’t access the site GIFSound.com now. Not sure it it’s because of Avast or FF. It’s a safe site.

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Edit: I can't access the site GIFSound.com now. Not sure it it's because of Avast or FF. It's a safe site.
There are no safe sites, safe today can be hacked tomorrow

I get not available from android. See pic in top righ corner here (click it for big pic) http://urlquery.net/report.php?id=1440340180068

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This is just a name search so may not be correct. For correct result you need to upload and test your file (s)
If tested before, click rescan for a fresh result

FirefoxCtype.dll
https://www.virustotal.com/en/file/beb9b6863a2e3df49ae96e9e05910915aec69f9433b3dcdb1a56965bfa81094e/analysis/

npFirefoxplugin.dll
https://www.virustotal.com/en/file/2e4118f281f131b02759a56eb298afee18f08b8c1cb94317f0ef001bb7d614de/analysis/

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I submitted them shortly after it happened. I just scanned the 2 files again while in the quarantine chest and now they’re listed as PUP’s instead of trojans. And that website is working now (might have been their site).