Missing Plugin for Firefox - Can't View Content

OS: Windows 7 Ultimate
Browser: Firefox 41.0.2 (latest)
Plugin: Shockwave Flash 19.0.0.226 (latest)
Plugin: Quicktime 7.1.0.210 was disabled, so I upgraded to 7.7.8.80.95 (latest)
Adobe Flash is installed and updated on my PC

Website Page: http://www.TheChessWebsite.com/easypuzzle1/

I am viewing a chess puzzle page and there is a plugin needed. I cannot figure out what plugin, or why mine isn't working. Flash is updated as is the latest Quicktime installed.

Any ideas how to investigate and fix this?

Missing Plugin
Jerry LAsked:
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Joe Winograd, Fellow&MVEDeveloperCommented:
It needs Java, which you may download from here:
https://java.com/en/download/

Regards, Joe
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strungCommented:
Either that or your security settings are preventing Java from running:  https://support.mozilla.org/en-US/questions/1042240
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Joe Winograd, Fellow&MVEDeveloperCommented:
Update: I also can't get to that site in FF41.0.2 — or in the latest Chrome, Opera, and IE11. I put an entry in the Exception Site List via Control Panel>Java>Security. The entry I put in was https rather http, as follows:
https://www.thechesswebsite.com/

I even put the subdomain in the list, which shouldn't be needed:
https://www.thechesswebsite.com/easypuzzle1/

java Exception Site List
And, of course, I went to the https sites, not the http ones. But it still didn't work:

jar file on different domain
I have no idea how to deal with the jar file being on a different domain. Regards, Joe

Update: I just noticed that the "different domain" of the jar file is simply that it's on the http domain, not the https one, so putting the http site in the java Exception Site List would likely work, but I'm reluctant to do that, as i know nothing about the site. It's probably fine, but as you know, http sites are considered a bigger risk than https ones.
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Jerry LAuthor Commented:
I didn't see anything in the page source that said it was a Java plugin, only Javascript.  How did you know it was Java that was missing?

But now that I've installed Java, as you suggested, the app place holder says to "Activate Java." So now, the "Allow" button pops up. (see attached screen capture.) Do you know, is that a built-in Firefox security app?

Nonetheless, after adding in Firefox a security exception for the website, I'm still getting a security message (different from the one Joe got, nothing about a 2nd domain) and the app won't run.

"Allow" Button
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Joe Winograd, Fellow&MVEDeveloperCommented:
> How did you know it was Java that was missing?

Because I already had Java installed, and I actually got the "Allow Now/Allow and Remember" choice that you posted, so I knew it was trying to run Java, and hence knew that Java was your missing plugin.

> Do you know, is that a built-in Firefox security app?

Yes. It is explained here:
https://support.mozilla.org/en-US/kb/how-allow-java-trusted-sites

> Nonetheless, after adding in Firefox a security exception for the website

You should add the exception in the Java console, as follows:

Control Panel
Java
Security

Then add http://www.TheChessWebsite.com/ to the Exception Site List:

Edit Site List
It will warn you that it is risky to add http sites to the list, but if you trust the site, do it (you may also need to add http://www.TheChessWebsite.com/easypuzzle1/). Regards, Joe
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Jerry LAuthor Commented:
I added the exception to the Java console as suggested. Now I am getting the warning about the separate domain. (See attachment.)

Question: Do you know where the "Allow" information is stored? Is it in cookies? Or is it elsewhere?

I am going to award points to this question and find another chess site on which to practice solving puzzles. This one looks good: http://www.365chess.com/puzzles.php

Java Exception
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Joe Winograd, Fellow&MVEDeveloperCommented:
> Now I am getting the warning about the separate domain. (See attachment.)

The message says that the https site is in the exceptions list, but it's complaining about the jar file at the http site being on a different domain, so make sure all four of these are in the exceptions list:

http://www.TheChessWebsite.com/
https://www.TheChessWebsite.com/
http://www.TheChessWebsite.com/easypuzzle1/
https://www.TheChessWebsite.com/easypuzzle1/

If it still doesn't work after that, I'd say your idea to find other sites is the best way forward.

> Do you know where the "Allow" information is stored? Is it in cookies? Or is it elsewhere?

Probably in the permissions.sqlite file in your Firefox profile, but I'm not sure about that. This support article may (or may not) help:
https://support.mozilla.org/en-US/kb/permissions-manager-give-ability-store-passwords-set-cookies-more

> I am going to award points to this question

Thanks for that — very nice of you!

> find another chess site on which to practice solving puzzles

Yes, good idea!

> This one looks good: http://www.365chess.com/puzzles.php

I'm not familiar with it, but at least it came right up when I clicked on the link. :)

This chess wiki site that I participate in may interest you:
http://chessprogramming.wikispaces.com

It is not a puzzle site, but there are some puzzles of sorts that folks use to test their chess programs, such as this:
http://chessprogramming.wikispaces.com/R%C3%A9ti+Endgame+Study

Perusing the site may lead you to some interesting puzzles, although a Google search may be the best bet, as is often the case these days. Regards, Joe
1
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