Why is there some "chrome-script" error everytime I right-click to save something?

Question

Same problem as many others have posted, with no solution. Every time I right-click to save something (like a website picture) I get this annoying error about needing to stop some script: "chrome://global/content/contentAreaUtils.js:910"
Then Mozilla either: 1) doesn't respond; or 2) says it's "Solved" when it's not, like here:
http://support.mozilla.com/en-US/forum/1/640519?s=history&as=q
== This happened ==
Every time Firefox opened
== ...ever I right-click to save something.

Answer 1

SOLUTION IN BRIEF
I had problems with the chrome://global/content/contentAreaUtils.js:910 script, which I solved by disabling the Add-on Plugin named Google Update 1.2.183.9. In the Tools menu select Add-ons, select Plugins, find Google Update 1.2.183.9, and select Disable. Caution: this may not be the best solution, as disabling an Add-on stops it from doing what it is supposed to do.
SOLUTION IN DETAIL
PROBLEMS
A number of people have posted problems relating to the scripts chrome://global/content/contentAreaUtils.js:910 and chrome://global/content/bindings/browser.xml:187
Problems reported include Firefox opening slowly and/or with an "unresponsive script" message, web pages loading slowly, and script errors occurring when trying to save images or download things.
PREVIOUSLY SUGGESTED SOLUTION
Previous posters on this or other threads have suggested the problem is caused by an Add-on. (Add-ons are found in the Tools menu. There are three kinds: Extensions, Themes, and Plugins.) They suggest following [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]] to identify the particular Add-on that is causing the problem, and to update it (if it is out of date) or to disable it.
However, [[Troubleshooting extensions and themes]] directs you to identify the offending Extension or Theme randomly, sorting through them one by one until you find the offender. This can be time consuming if you have a lot of them. [[Troubleshooting plugins]] better suggests to start by honing in on a particular suspect Add-on.
SUGGESTED SOLUTION: SUSPECT GOOGLE ADD-ONS
I noted that both scripts people report problems with start with "chrome,” so I suspected the problem Add-On would be from Google and have something to do with their Chrome browser. Using the Tools menu I looked through my Add-Ons and found only two related to Google. One was downloaded after the problems started so I ignored it. The other is the Plugin named Google Update 1.2.183.29.
I tried to update it via Find Updates in the Add-ons window. This launched Mozilla Plugin Check, which lists Google Update 1.2.183.9 as “Unable to Detect Plugin Version.” Clicking “Research” did not yield any easy to find information about a newer version, so I chose to Disable the update entirely via the Add-ons window. Firefox now runs fine.
Note that disabling an Add-on will stop if from doing what it is supposed to do. I do not know what Google Update 1.2.183.9 does and could not readily find anything definitive about it in the Research results, although one person said, “There are several parts of Firefox which are updated by Google. One is the security ‘blacklist’ for spoofed sites and another is the Google Search in the navigation bar. The update may be for something else. Look in your about:config file and see if there's something added over and above the search and security. Might not hurt to see what the Google update plugin is linked to.”