Firefox Vertical Scroll Bar Not Functioning Properly

Question

== Issue
==
Firefox is having problems with certain web sites
== Description
==
As I visited the referenced Web page, although the page displays normally, vertical scrolling is impaired. Clicking and dragging the vertical scroll "handle" DOES work. However, to scroll up or down by the height of the browser's display area, you'd click in the "blank space" immediately above or below the vertical scroll handle (comparable to using your keyboard's PageUp or PageDown buttons), and this is the scrolling method that does not work. Clicking the vertical scroll arrows does not work either.
== URL of affected sites
==
http://www.snopes.com/politics/obama/memorialday.asp
== Troubleshooting information
==
AVG Safe Search 9.0.0.825 true {3f963a5b-e555-4543-90e2-c3908898db71}
DownloadHelper 4.7.3 true
Google Gears 0.5.36.0 true {000a9d1c-beef-4f90-9363-039d445309b8}
Java Console 6.0.13 true
McAfee SiteAdvisor 3.0 true
Microsoft .NET Framework Assistant 1.2.1 true {20a82645-c095-46ed-80e3-08825760534b}
ScrapBook 1.3.7 true {53A03D43-5363-4669-8190-99061B2DEBA5}
Xippee Extension 2.51 false [email protected]
Yahoo! Toolbar 2.1.2.20100119091315 true {635abd67-4fe9-1b23-4f01-e679fa7484c1}
Evernote Web Clipper 3.0.0.82006 true
Java Console 6.0.15 true
Java Console 6.0.16 true
Java Console 6.0.17 true
Java Console 6.0.18 true
== Firefox version
==
3.6.3
== Operating system
==
Windows Vista
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3 ( .NET CLR 3.5.30729)
== Plugins installed
==
*-Shockwave Flash 10.0 r45
*np-mswmp
*NPRuntime Script Plug-in Library for Java(TM) Deploy
*Winamp Application Detector
*Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
*Default Plug-in
*Google Update
*Adobe Shockwave for Director Netscape plug-in, version 11.0
*iTunes Detector Plug-in
*DivX® Web Player
*DivX® Content Upload Plugin
*npdivxplayerplugin
*GEPlugin
*Yahoo Application State Plugin version 1.0.0.7
*3.0.50106.0
*Office Live Update v1.5
*NPWLPG
*Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
*Google Updater pluginhttp://pack.google.com/
*6.0.12.69
*RealPlayer(tm) LiveConnect-Enabled Plug-In
*RealJukebox Netscape Plugin
*Allows browsing on RealArcade sites with Mozilla browsers.
*Rhapsody Player Engine Plugin
*Java(TM) Platform SE binary
*Next Generation Java Plug-in 1.6.0_18 for Mozilla browsers
*The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.

Answer 1

This may or may not be related, but I was having a similar issue, and it was affecting the same page in Chrome as well!
Turns out my issue was that the page was calling home via AJAX and my bandwidth at the moment was impaired, as I was downloading a big file.
Once I stopped the download, everything went back to normal, with only a tiny hiccup on the page scrollbars once every some seconds, where they would get stuck for a few milliseconds.
This is probably caused by the page using synchronous AJAX calls, instead of asynchronous ones. Synchronous calls will block the browser until a response is received from the server. If bandwidth is compromised, this response will be delayed or even worse, not received at all, in which case the page will stop working (or at least this seems like what would happen, don't know if it is actually true).
Hope this helps.