willeyeam said

I'm using ESR version 52.2.1 (32-bit) on Windows 10 and npplugin.

What plugin is that? Is it Java?

If I accept the warnings and then change tabs or minimize and maximize the browser, they work normally.

I don't know why merely switching among tabs resolves the issue. There occasionally are bugs with "painting" the screen, but this sounds a bit different, since rather than being a display problem, it sounds as though the event handler for clicks on certain controls isn't enabled immediately.

Not getting any brainwaves here...

Thanks for your reply. The plugin is Java and I've tried 1.60 and 1.80. I strongly suspect the problem is related to the security warning as the phenomenon doesn't occur if, as I said before, I cancel the warning or go to another tab and then back, or minimize and maximize the window.

So the click event handler for the input elements (all of them) are enabled before the dialogs appear, and after, if they're canceled, but not after if they're not canceled.

I have another apparently related threading problem but I'll save that for a separate post. Can you tell me whether there is a site dedicated to ESR related questions, or better yet, ESR and Java plugin questions? Thanks again.

There is an Enterprise Working Group for ESR users in large companies, but I've never joined the mailing list to see whether this is the kind of issue they discuss.

Do you recall the last version of Firefox in which this Java applet worked normally?

Have you tried "the usual":

If a site is generally known to work in Firefox, these are general suggestions to try when it stops working correctly:

Cache and Cookies: When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Clear Firefox's Cache

See: How to clear the Firefox cache

If you have a large hard drive, this might take a few minutes. If you do not see the number going down on the page, you can reload it using Ctrl+r to check progress.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info > Security > "View Cookies"
• (menu bar) Tools > Page Info > Security > "View Cookies"
• click the padlock or "i" icon in the address bar, then the ">" button, then More Information, and finally the "View Cookies" button

In the dialog that opens, the current site should be pre-filled in the search box at the top of the dialog so you can remove that site's cookies individually.

Then try reloading the page. Does that help?

Testing in Firefox's Safe Mode: In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement? (More info: Diagnose Firefox issues using Troubleshoot Mode)

I've signed up to the mailing list you mentioned and will take a look at the archives to see how much interest remains for the Java plugin and whether anyone has mentioned this. I don't recall this happening on previous versions of Firefox and would have to go back and install them. I tried 50 this morning with the same results.

I have tried "the usual" - flushing the Firefox cache of everything, including cookies, and all possible temporary files and applications from the Java Control Panel.

I started Firefox in Safe Mode and had the same results.

The Java applet methods are all empty except for destroy. Assuming the fault is mine, which I do, I imagine one of my JavaScript methods is at fault, although I haven't been able to find anything that would affect the input fields only and allow others like the buttons and checkboxes to work properly.

So no improvement but I do appreciate your taking the time to help.

Thanks.