Suggest existing alias when one exists for a website
When entering email on a website, the Firefox extension suggests either real email address or hide my email, but the hide my email address is always a new one, not an existing one for the same website. This could easily unnecessarily create extra clutter/confusion especially when checking out "as guest". Option to create a new alias is good, so you're not limited to the single alias for a site (like iCloud's hide my email), but easily entering existing alias is more important.

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PFR commented
I second this. This is one of the main reasons that I never use the e-mail suggestion in fields, and always end up in the extension manually creating one.
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CC commented
Dear team,
Please implement this. This is a pain to have to go back to the extension and search for the alias we already have. Please provide the same autocomplete as for login.
This is is killing the concept without that.
Thank you