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Right-click on a search box > "Add a Keyword for this Search".

Edit: it then gets saved as a bookmark and you can edit it like any other.

I don't have that. Where? Algolia and google search boxes(? the input fields?) don't show anything like that.

edit: also if I modify a keyword for my opensearch/xml search engines in about:preferences#search , it won't show up as a regular bookmark. Also I can't even see the URL for those search engines.

Right click inside a search box. There should be the option "Add a Keyword for this search".

Where? What is a search box?

The search input provided by a website. You can try with the one in the footer of Hacker News and it works. See https://imgur.com/oxqMw6D

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