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Why can't I select "preview in firefox" for adobe files anymore?

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I work in an online cyber school and I will often use iframe share pdf's in my lesson. Previously, under options and applications, I could select these files to be previewed in Firefox instead of trying to download automatically. Now that option is gone and I would like to know why or how to fix it. I need my students to be able to view the stories easily in the lesson instead of needing to download them, find them and open them and then trying to find their way back to the lesson.

I work in an online cyber school and I will often use iframe share pdf's in my lesson. Previously, under options and applications, I could select these files to be previewed in Firefox instead of trying to download automatically. Now that option is gone and I would like to know why or how to fix it. I need my students to be able to view the stories easily in the lesson instead of needing to download them, find them and open them and then trying to find their way back to the lesson.

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Please update to the most recent version of Firefox, version 40.0.3:

Second, what is the default pdf reader that is installed in Firefox, pdf.js?

In order to change the default reader for PDF files (to not open PDF files with Firefox's internal PDF reader), follow these steps:

  1. Click the menu button New Fx Menu and click Options (Preferences for Linux and Mac).
  2. In the Options (Preferences for Linux and Mac) tab (window for previous than 38.0 firefox version), select the Applications panel.
  3. In the Search field, type PDF. You should find Portable Document Format (PDF).
  4. On the right hand side you should find an Action column. Use that to select your favorite PDF reader. In order to view PDF files in Firefox, choose Preview in Firefox.

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