Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Adobe Acrobat Add-On 11.0.6.70 will not allow me to download a .pdf file. Disabling the Add-On allows me to download the .pdf.

more options

I attempted to download a .pdf file and open it with Adobe Add-On 11.0.6.70 in FF 25.0.1 and got a message that the file was damaged and could not be repaired. I called the site's Tech Support and they requested that I try the download with another (Ugh!) browser and the download worked. I went back and disabled the Adobe Add-On in FF and the download worked in FF also. Not sure who developed the Add-On but whoever did so, left a bug in the process.

I attempted to download a .pdf file and open it with Adobe Add-On 11.0.6.70 in FF 25.0.1 and got a message that the file was damaged and could not be repaired. I called the site's Tech Support and they requested that I try the download with another (Ugh!) browser and the download worked. I went back and disabled the Adobe Add-On in FF and the download worked in FF also. Not sure who developed the Add-On but whoever did so, left a bug in the process.

Chosen solution

HI central_texan,

Please update to the latest version of Firefox by going to the About Firefox in the Firefox menu. If downloads hang at the last minute (just before reaching 100%), the cause might be antivirus software which tries to scan the file and during that process hangs the Firefox instance. It may also happen when the download becomes corrupt. What I want to know is in the System Requirements what " Firefox Extended Support Release" means.

In order to fix the problem, try disabling the scanning as follows:

  1. In the Location bar, type about:config and press Enter. The about:config "This might void your warranty!" warning page may appear.
  2. Click I'll be careful, I promise!, to continue to the about:config page. A list of settings should appear
  3. Filter the list by typing in the search bar at the top. Type in scanWhenDone. You should now find the browser.download.manager.scanWhenDone preference.
  4. Double-click on that preference to set the value to false.
  5. Next, try to download something and see if it still hangs.

Please reply and tell us whether this helped you!

Read this answer in context 👍 0

All Replies (2)

more options

Chosen Solution

HI central_texan,

Please update to the latest version of Firefox by going to the About Firefox in the Firefox menu. If downloads hang at the last minute (just before reaching 100%), the cause might be antivirus software which tries to scan the file and during that process hangs the Firefox instance. It may also happen when the download becomes corrupt. What I want to know is in the System Requirements what " Firefox Extended Support Release" means.

In order to fix the problem, try disabling the scanning as follows:

  1. In the Location bar, type about:config and press Enter. The about:config "This might void your warranty!" warning page may appear.
  2. Click I'll be careful, I promise!, to continue to the about:config page. A list of settings should appear
  3. Filter the list by typing in the search bar at the top. Type in scanWhenDone. You should now find the browser.download.manager.scanWhenDone preference.
  4. Double-click on that preference to set the value to false.
  5. Next, try to download something and see if it still hangs.

Please reply and tell us whether this helped you!

more options

I re-enabled the add-on and did what you asked and I was able to view the .pdf that I was previously unable to see. Thanks for the tip.