Extensions troubleshooting - Mozilla Suite
From MozillaZine Knowledge Base
This article applies to Mozilla Suite/SeaMonkey 1.x
Caution: There is also a "chrome" folder in the program installation directory. Do not rename it by mistake!
When you next restart the application, a new, empty "chrome" folder will be created in the profile and your previously added extensions or themes will not be used.
If it turns out that the problem was not be caused by an extension, you can restore your extensions and themes by deleting (or renaming) the new "chrome" folder (e.g., rename it "newchrome") and then renaming the original chrome folder back to "chrome".