Pressing spacebas is solution here.
Game hangs after pressing "start". Firefox.
**ERROR**: Condition "!f" is true. Returned: ERR_CANT_OPEN index.js:354:18
At: scene/resources/texture.cpp:502:_load_data() - Condition "!f" is true. Returned: ERR_CANT_OPEN index.js:354:18
**ERROR**: Error opening file 'res://Sprites/icon.png'. index.js:354:18
At: core/io/image_loader.cpp:56:load_image() - Error opening file 'res://Sprites/icon.png'. index.js:354:18
**ERROR**: Condition "!is_inside_tree()" is true. Returned: get_transform() index.js:354:18
At: scene/2d/canvas_item.cpp:467:get_global_transform() - Condition "!is_inside_tree()" is true. Returned: get_transform() index.js:354:18