Article in English: As of Mozilla Firefox version 69, the option to allow Flash to run automatically has been disabled. You can still run Flash on individual websites by providing permission when asked. The Flash plugin should be ready to go by default, but follow these steps to make sure:  Click the three-line menu at the top-right corner of Firefox. Click Add-ons. Click Plugins. If Flash appears in the Enabled list, just click the X on the tab to close it. If Flash is in the Disabled list, click its corresponding three-dot icon and select Ask to Activate from the drop-down menu. Then, close the browser tab. You should see a message that says "Run Adobe Flash" appear. If you don't see this message, right-click the page with Flash content on it and click the Refresh icon (the curved arrow). The page will now display Flash.

Summary in Indonesian:
Buka Firefox pada PC atau komputer Mac. Pastikan Flash sudah diaktifkan. Kunjungi situs web yang memuat konten Flash. Klik Run Adobe Flash agar konten dapat dimuat.