Cannot open .pdfs in Firefox
My wife's machine is running Windows 8.1, Firefox 34.0.5 and Adobe Acrobat X Standard. Cannot open .pdfs in the browser. Clicking a link to a .pdf will open a new tab that immediately closes, leaving me right back where I was, as if I had never clicked the link. I can right click, then Save As, download the file and open in Adobe Acrobat X. But that's not what I want, and not how it was designed.
Internet Explorer 11 opens .pdfs in the environment described above, in-browser, with no problems.
I've followed all the instructions at https://support.mozilla.org/en-US/questions/972278 and http://helpx.adobe.com/acrobat/kb/cant-view-pdf-web.html. Neither Mozilla's nor Adobe's instructions can get me up and running.
As a nuclear option, I uninstalled Adobe Acrobat, restarted the machine, uninstalled Firefox, restarted the machine, re-installed Adobe Acrobat, restarted the machine, and re-installed Firefox, and restarted the machine. Attempting to open any .pdf yields the same result, even after uninstalling and re-installing everything. What's going on here? Why does Firefox open a blank tab, and then close it right away? Block pop-ups is set to off, and antivirus pop-up blocking is disabled.
My own machine running Windows 7, Firefox 34.0.5, and Adobe Acrobat X Standard opens .pdfs in-browser just fine, with no problems.
Any advice? I'm pulling my hair out!! Thanks for your time.
kjbgu04
Isisombululo esikhethiwe
Hey,
Try the following:
- Go to setting (3 bars) > options > applications.
- Under applications panel.
- Find Portable Document Format (PDF) in the list and click on it to select it.
- Click on the drop-down arrow in the Action column for the above entry and select Use PDF reader name (in Firefox) or preview in firefox.
If PDF files are still downloaded instead of displayed, try these solutions Reset download actions
- Open your profile folder:
Click the menu button
, click help
and select Troubleshooting Information. The Troubleshooting Information tab will open.
Under the Application Basics section, click on Show Folder. A window with your profile files will open.
Click the menu buttonand then click Exit 
Delete the mimetypes.rdf file.
Then open firefox again and see.
I hope it helps.
Funda le mpendulo ngokuhambisana nalesi sihloko 👍 5All Replies (6)
Isisombululo Esikhethiwe
Hey,
Try the following:
- Go to setting (3 bars) > options > applications.
- Under applications panel.
- Find Portable Document Format (PDF) in the list and click on it to select it.
- Click on the drop-down arrow in the Action column for the above entry and select Use PDF reader name (in Firefox) or preview in firefox.
If PDF files are still downloaded instead of displayed, try these solutions Reset download actions
- Open your profile folder:
Click the menu button, click helpand select Troubleshooting Information. The Troubleshooting Information tab will open.
Under the Application Basics section, click on Show Folder. A window with your profile files will open.
Click the menu buttonand then click Exit
Delete the mimetypes.rdf file.
Then open firefox again and see.
I hope it helps.
Did all of this, no changes. Still opens a tab that immediately closes, and asks me to save instead. Very frustrating. Installed Acrobat Reader, checked the settings there, no difference. Running Windows 7 Ultimate and Firefox 38.0.5. Any other potential solutions?
You can change the action for Portable Document Format (PDF) from Preview in Firefox to use another application like the Adobe Reader or set to Always Ask in "Firefox > Options/Preferences > Applications".
You can set the pdfjs.disabled pref to true on the about:config page to disable the build-in PDF viewer.
You can check the value of the plugin.disable_full_page_plugin_for_types pref on the about:config page and remove the application/pdf part if present or reset the pref to the default via the right-click context menu if you want to display PDF documents in Firefox with another application (i.e. not the built-in PDF Viewer).
Thanks for the help. Still the same. Doesn't matter if I choose preview in Firefox or Acrobat. Blank tab opens, closes, and then it asks me to save or open. Tried changing settings on both prefs. No difference. Thanks though.
Isn't the internal PDF Viewer able to show PDF files as well?
You can try to disable hardware acceleration in Firefox.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need to close and restart Firefox after toggling this setting.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
- Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
- Do NOT click the Reset button on the Safe Mode start window
Still bombs in safe mode, running the default theme. Changing hardware acceleration setting (and restarting Firefox) does nothing. Same thing happens. PDFs are set to preview in Firefox. Thanks.