I've only been using Kagi for a couple of days now, but the search results on programming topics are leagues better than Duckduckgo. I may be a little late to the party, but just realised that you can have shared state between pages without polluting `_app.tsx` in NextJS. I credit Kagi for taking me to this page where I learned about `getLayout`.
[https://nextjs.org/docs/pages/building-your-application/routing/pages-and-layouts#per-page-layouts](https://nextjs.org/docs/pages/building-your-application/routing/pages-and-layouts#per-page-layouts)
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Here is how to add Kagi as your default search engine to Firefox on NixOS (home-manager)

```nix lang="nix"
home-manager.users.<my-user>.programs.firefox = {
  enable = true;
  profiles = {
    myProfile = {
      ...
      search = {
        force = true;
        default = "Kagi";
        engines = {
          "Kagi" = {
            urls = [
              { 
                template = "https://kagi.com/search?q={searchTerms}"; 
              }
            ];
            iconUpdateURL = "https://assets.kagi.com/v2/favicon-32x32.png";
            updateInterval = 24 * 60 * 60 * 1000; # every day
            definedAliases = [ "@kg" ];
        ...

```


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