# Debugging an addon in Fenix Nightly

**URL:** <https://discourse.mozilla.org/t/debugging-an-addon-in-fenix-nightly/68011>\
**Category:** Add-on Support\
**Created:** [September 23, 2020, 10:11am UTC](https://discourse.mozilla.org/t/debugging-an-addon-in-fenix-nightly/68011 "2020-09-23T10:11:34Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![juraj.masiar](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/juraj.masiar/32/30587_2.png) [@juraj.masiar](https://discourse.mozilla.org/u/juraj.masiar)\
**Post date:** [September 24, 2020, 1:56pm UTC](https://discourse.mozilla.org/t/debugging-an-addon-in-fenix-nightly/68011/4 "2020-09-24T13:56:42Z")

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Ideally you should use Nightly Desktop to debug Nightly Firefox for Android. Or at least release version, not ESR.  
The compatibility policy is to support 2 versions gap:

> [@Is Android debugging still working?](https://discourse.mozilla.org/t/is-android-debugging-still-working/51681/2):
>
> Hi! Yes, remote debugging should still work fine slight_smile If you are trying to debug Firefox for Android on your emulator, be aware that it is based on Firefox ESR (v68), so you need to connect to it from Firefox Desktop ESR68. You can download Firefox ESR at [https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr](https://www.mozilla.org/en-US/firefox/all/#product-desktop-esr) Our backward compatibility policy only supports a gap of 2 versions. This means that Firefox for Android (aka Fennec) can only be debugged from: Firefox 68, Firefox 6…

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_[View the full topic](https://discourse.mozilla.org/t/debugging-an-addon-in-fenix-nightly/68011)._