Overview
Mozilla's Firefox (Gecko) can be used to access Hoxhunt service via Outlook on the Web or Gmail. However, it's not a default browser used by any version of Outlook or Gmail client to run Hoxhunt add-in.
For optimal Hoxhunt experience, make sure you are running a stable and recent version of Firefox.
In normal situations, no further configuration is needed for optimal Hoxhunt experience. However, if you encounter issues when using Hoxhunt add-in with Firefox, please check the following settings.
Check Enhanced Tracking Prevention level
1. Open Firefox.
2. Go to about:preferences#privacy.
3. Set Enhanced Tracking Prevention to Standard.
TIP: If you can't use Standard level or Hoxhunt is still not working correctly, please open each of the following sites in a new Firefox tab:
officejs.hoxhunt.com
game.hoxhunt.com
app.hoxhunt.com
auth.hoxhunt.com
Then, click on the shield icon next to the site URLs.
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Toggle the switch to OFF position.

Repeat the steps to each site and restart Firefox.
Pop-up windows should be allowed for Hoxhunt
1. Open Firefox.
2. Go to about:preferences#privacy.
3. Scroll down to Permissions, and make sure Block pop-up windows is not checked.
(If you don't want to allow pop-up windows for all sites, select Exceptions..., and then type hoxhunt.com and click Allow and Save changes.)
5. Restart Firefox and try Hoxhunt add-in again.