Is your Flash set to "always activate" or "ask to activate"? You can check that on the Add-ons page using either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. Then on the right side, check the "Shockwave Flash" plugin.

If your site permission is "Ask to Activate" then you need to approve sites using the plugin notification icon in the address bar that typically looks like a small, dark gray Lego block.

While Firefox usually will also show a link in a black rectangle in the page or an infobar sliding down between the toolbar area and the page, those are not always present so please check the notification icon to make sure Flash is allowed on the problem site.

If the notification icon never appears, some kind of filter/block may be affecting Flash objects.

Your Question Details > More System Details lists numerous other plugins. To avoid video player conflicts, could you set everything you can live without for 24 hours to "Never Activate"? In some cases, this doesn't take effect in existing windows, but only in new windows. You can open a new window for testing using Ctrl+n or the menu.

Any improvement so far?

This is some standard guidance that addresses the most common issues with the Flash Player plugin. I'm sure you've seen some of it before, but just in case:

(1) If you have any recorders/downloaders that interact with Flash media make sure they are as up-to-date as possible, or disable them temporarily.

(2) Disable hardware acceleration in Flash: right-click the media in the player and choose Settings, then the first mini-tab and uncheck the box to use hardware acceleration.

More information in this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues

(3) Disable protected mode (Windows Vista and higher)

The protected mode feature of the Flash player plugin has security benefits, but seems to have compatibility issues on some systems. You can disable it using the Add-ons page. Either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. On the right side, find "Shockwave Flash" and click the More link. Then uncheck the box for "Enable Adobe Flash protected mode" and try that for a day to see whether it helps.

jscher2000 said

Is your Flash set to "always activate" or "ask to activate"? You can check that on the Add-ons page using either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. Then on the right side, check the "Shockwave Flash" plugin. If your site permission is "Ask to Activate" then you need to approve sites using the plugin notification icon in the address bar that typically looks like a small, dark gray Lego block. While Firefox usually will also show a link in a black rectangle in the page or an infobar sliding down between the toolbar area and the page, those are not always present so please check the notification icon to make sure Flash is allowed on the problem site. If the notification icon never appears, some kind of filter/block may be affecting Flash objects.

---

Your Question Details > More System Details lists numerous other plugins. To avoid video player conflicts, could you set everything you can live without for 24 hours to "Never Activate"? In some cases, this doesn't take effect in existing windows, but only in new windows. You can open a new window for testing using Ctrl+n or the menu.

Any improvement so far?

It's set to Always Activate.

Even after setting all other plugins to Never Activate, behavior did not change.