This looks like a game that still uses Flash, so you need to enable Flash to make this game work.
You can find a Lego block icon at the left end of the location bar indicating that the web page uses a plugin (Flash) that Firefox might block.
You can click this Lego block icon to allow or block this plugin.
Note that Flash support in browsers will end in December this year (2020), so it is up to Zynga to port the game to HTML5 if they haven't done this yet.
This looks like a game that still uses Flash, so you need to enable Flash to make this game work.
You can find a Lego block icon at the left end of the location bar indicating that the web page uses a plugin (Flash) that Firefox might block.
You can click this Lego block icon to allow or block this plugin.
*https://support.mozilla.org/en-US/kb/why-do-i-have-click-activate-plugins
Note that Flash support in browsers will end in December this year (2020), so it is up to Zynga to port the game to HTML5 if they haven't done this yet.
*https://www.fbgamecity.com/2019/10/player-at-risk-will-farmville-2-be-ban.html
