> For the complete documentation index, see [llms.txt](https://www.fullstackfirebase.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.fullstackfirebase.com/cloud-firestore/walkthrough.md).

# Walkthrough

## Open the app

Open the app at [fogo.howtofirebase.com](https://fogo.howtofirebase.com/).

## Open DevTools

[Sourcemaps are currently broken in Chrome](https://github.com/webpack/webpack/issues/3165) for Fogo as of July 2018.

This is best done in Firefox.

Right-click `inspect element` and select the `Debugger` tab. Then click `command + P` to search for and open two files:

* `observers/images.observer.js`,
* and `queries/images.query.js`.

![observers/images.observer.js](https://goo.gl/DeEsZT)

![queries/images.query.js](https://goo.gl/pMa7ad)

## Video

{% embed url="<https://youtu.be/eOXlUYruPjw>" %}