docs: better describe how to install Firefox Nightly with Puppeteer (#…

…6226) Co-authored-by: Mathias Bynens <mathias@qiwi.be>
puppeteer · Jul 16, 2020 · 82645e8 · 82645e8 · mathias22osterhagen22 · Jul 21, 2020
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diff --git a/docs/api.md b/docs/api.md
@@ -593,7 +593,7 @@ const browser = await puppeteer.launch({
 #### puppeteer.product
 - returns: <[string]> returns the name of the browser that is under automation (`"chrome"` or `"firefox"`)
 
-The product is set by the `PUPPETEER_PRODUCT` environment variable or the `product` option in [puppeteer.launch([options])](#puppeteerlaunchoptions) and defaults to `chrome`. Firefox support is experimental.
+The product is set by the `PUPPETEER_PRODUCT` environment variable or the `product` option in [puppeteer.launch([options])](#puppeteerlaunchoptions) and defaults to `chrome`. Firefox support is experimental and requires to install Puppeteer via `PUPPETEER_PRODUCT=firefox npm i puppeteer`.
 
 
 ### class: BrowserFetcher

diff --git a/src/node/Launcher.ts b/src/node/Launcher.ts
@@ -771,7 +771,7 @@ function resolveExecutablePath(
   }
   const revisionInfo = browserFetcher.revisionInfo(launcher._preferredRevision);
   const missingText = !revisionInfo.local
-    ? `Could not find browser revision ${launcher._preferredRevision}. Run "npm install" or "yarn install" to download a browser binary.`
+    ? `Could not find browser revision ${launcher._preferredRevision}. Run "PUPPETEER_PRODUCT=firefox npm install" or "PUPPETEER_PRODUCT=firefox yarn install" to download a supported Firefox browser binary.`
     : null;
   return { executablePath: revisionInfo.executablePath, missingText };
 }