You have the most current version (9.3.3) of Adobe Reader installed on the system that you used to post your question. Check your version here: http://www.mozilla.com/en-US/plugincheck/ The instructions on the Adobe site are out-of-date and do not apply to current versions of Firefox. You might want to bookmark this message for future reference when updating Adobe Reader. The correct procedure is below. <u>'''Install/Update Adobe Reader for Firefox (aka Adobe PDF Plug-In For Firefox)'''</u>: your ver. 9.3.3; current ver. 9.3.3 (important security update release 06-29-2010; see: http://www.adobe.com/support/security/bulletins/apsb10-15.html) ~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/ See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader ''<u>You may be able to update from the Adobe Reader installed on your system</u>'' instead of going to the Adobe site and downloading. Start > Program Files, find and click Adobe Reader to open, click Help, click Check for Updates. ''<u>If you go to the Adobe site to download the current Adobe Reader:</u>'' -'''<u>use Firefox to download</u>''' and <u>'''SAVE to your hard drive'''</u> (save to Desktop for easy access) ~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~ -exit Firefox (File > Exit) -check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'') -double-click on the Adobe Reader installer you just downloaded to install/update Adobe Reader *<u>'''NOTE: On Vista and Windows 7'''</u> you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm *'''<u>NOTE for IE:</u>''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version. To install/update the IE ActiveX version, same instructions as above, except use IE to download the ActiveX installer. See: [[ActiveX]] *Also see: http://kb.mozillazine.org/Adobe_Reader ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]