Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
Open

FireFox will no longer open a PDFs in Mac Default viewer.

Firefox PDFs
Kristina replied 3 hours ago
Kristina
Kristina

After the last Firefox update, I can no longer open download files (PDFs) from websites in Mac Default Viewer. I have tried the other settings such as open with Adobe, Ask, etc., but they continue to only open in the browser. For work, I download hundreds of documents from a county site, so having them open in my default viewer when I click the link was very useful for a productive work flow. I have tried to open files with my viewer from other sites, but it fails with those too. My tech team tried to help but seems to be a Firefox issue. Settings - Downloads - Files and Applications - PDF - Use Preview (or anything else) is not working. Firefox 157.01, Apple M2 Pro, Tahoe 26.6.2.

After the last Firefox update, I can no longer open download files (PDFs) from websites in Mac Default Viewer. I have tried the other settings such as open with Adobe, Ask, etc., but they continue to only open in the browser. For work, I download hundreds of documents from a county site, so having them open in my default viewer when I click the link was very useful for a productive work flow. I have tried to open files with my viewer from other sites, but it fails with those too. My tech team tried to help but seems to be a Firefox issue. Settings - Downloads - Files and Applications - PDF - Use Preview (or anything else) is not working. Firefox 157.01, Apple M2 Pro, Tahoe 26.6.2.

All Replies (2)

TyDraniu
TyDraniu
  • Top 10 Contributor

Right now you can only use a fallback, switching pdfjs.disabled to true in about:config.

Kristina
Kristina Question owner

I did this last week, but still not much faster than opening and downloading them from the browser. Hopefully there will be a fix soon.

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.