1. Where can a merchant find Magento extensions?
2. What are the two ways of installing an extension in Magento?
Installing via MagentoConnect
Manually copying files to the filesystem
If the extension was obtained directly from a vendor or written yourself, you’ll need to copy the extension into the correct Magento source directories.
3. How can a Magento Admin user disable an extension using admin functionality?
In the backend, navigate to `System -> Configuration -> Advanced Disable Modules Output`
Installed modules are shown and individual modules can be disabled here.