Enabling Adobe PDF plugin Internet Explorer Safari Chrome Firefox Opera Troubleshooting Back How to enable the PDF plugin in IE. Choose Tools from the menu. Choose Enable plug ins and Enable java, hook on. How to enable the PDF plugin in Chrome. Launch Google Chrome browser. Make sure you are using latest Chrome 6. Type chrome plugins in the address bar and hit the Enter key. Click Disable next to Chrome PDF viewer. Click Enable next to Chrome PDF viewer. How to enable the PDF plugin in Firefox. From the Tools menu select Add ons, the click on the Plugins icon at the top. Click on the Adobe Reader brick it may say 8. X. To disable the plugin. Disable. If it says. Enable, click it. How to enable the PDF plugin in Opera. Launch Opera browser. Type opera plugins in the address bar and hit the Enter key. Click Enable next to Adobe Acrobat. Back. Troubleshooting. Cant download or install Reader. Cant open PDF3. Cant view a PDF on the web. Printing problems. Cant view PDF on the web. Known issues Acrobat X, Reader X7. Error 1. 40. 2 Error 1. Install Adobe Reader Plugin For Firefox© 2017