I'm using Firefox, why does the URL show "chrome://lastpass/content/home2.xul" ?

The chrome:// protocol has been used by Firefox before Google Chrome existed. It is is the default name that Firefox uses for internal URLs, including the LastPass local Vault.
 
You can learn more about it from mozilla's glossary here https://developer.mozilla.org/en-US/docs/Glossary/Chrome.
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