You can get Steam Inventory Helper for Firefox, there's a link in the chrome store at the very bottom of the description. The times I've used it however, Firefox has wanted to remove it since it doesn't think it's safe.
Don't really know of any others.
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Yes it's because the addon is unsigned, although there is a way to enable it in Firefox by doing the following...
about:config --> xpinstall.signatures.required --> set it to false
However this trick above will no longer work in version 42 of FF, as the override will be disabled.
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Since someone has been having me mass sell keys to get NZ prices, and my primary browser is Firefox, I'm wondering if there is anything similar to the Chrome addon, Steam Inventory Helper.
No, I won't switch browsers for it. My Chrome browser has only been used for my alt Steam account and would need 7 days even if I wanted to boot up Chrome. Its only kept installed because its better than forcing visitors to use IE. :P
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