Suggest an alternative to

add-custom-search-engine

Add a custom search engine to the list of available search engines in Firefox

Why do you think that https://github.com/aminomancer/uc.css.js is a good alternative to add-custom-search-engine

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with add-custom-search-engine. Optional.

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