UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0

Example URL:
https://www.edgebee.com/games?id=1

Steps to reproduce the problem:
(1)Entering the game and choosing any starting party utilizing the buttons on the bottom of the screen;
(2)Going to the store in the city (just going back the first stair);
(3)Clicking through the dialog;
(4)Going to the shop using the buttons on the bottom of the screen (hover the mouse until you see shop);
(5) Click through the dialogs;
(6) try to drag any item from the shop to any of your characters. Normally you would drag the items. But Flash Player 26 don't permit it.

What is the expected behavior?
Those little buttons on the right of the screen on the print below were meant to work. The same with the slider. The items might be drag and dropped to the character at the bottom of the screen, as in the picture in this link (look at the pointer of the mouse, it is carrying a blue item from the shop to the character. This print was taken with Flash Player downgraded to version 25):
http://puu.sh/wksEC/5a515770e0.jpg

What went wrong?
The buttons don't work if clicked. The slider don't work. The items can't be dragged at all. With this feature not working, the progress trough the game is not possible, making this version of Flash Player unsuitable to play that game.

Does it occur on multiple sites: N/A

Is it a problem with a plugin? Yes Adobe Flash Player

Did this work before? Yes (Released 05/09/2017) Flash Player 25.0.0.171 (401 MB)

Does this work in other browsers? No
 Firefox 53.0.3 (32-bit)

Chrome version: <Copy from: 'about:version'>  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 26.0 r0

It seems the new release of Flash Player (version 26, released in 13/06/2017) is not compatible with some features of this particular game (I haven't tested it with other games or sites). Some features of the game stopped working after Flash Player was automatically updated to version 26. After  downgraded it to version 25 again it all went back to normal. It is not a problem with the game. It is a problem with version 26 of Flash Player.
Also, I am not the only one who experienced this problem. Neither the only one who used this downgrading method to overcome this problem. Me and other players exchanged experience on the in-game chat about it.