Disclosure: I work for AgileBits, makers of 1Password.
For browser extensions, the URL constructor would be even easier: https://developer.mozilla.org/en-US/docs/Web/API/URL/URL (Yes, I know it says that IE doesn't support it, but IE doesn't have a proper extensions framework, so it's irrelevant to this topic.)
For browser extensions, the URL constructor would be even easier: https://developer.mozilla.org/en-US/docs/Web/API/URL/URL (Yes, I know it says that IE doesn't support it, but IE doesn't have a proper extensions framework, so it's irrelevant to this topic.)