Hello, sorry to see you are having this issue. Try right clicking and closing this dialogue box or try to make it small again by double clicking the box or it's borders. Hope this helps!

Hi, Thanks for getting back so quick. I tried, but the resizing of dialogue box doesn't work. Apart from the "Escape" button (to exit the dialogue box) nothing works.

Terminate the Firefox process, and try again -- this time click on the prompt instead of clicking Enter.

To add more to this problem description, I see that the issue persists even after a system reboot.

Make sure your DPi settings are correct on your computer! This can be an issue too.

Pressing "Enter" button on the "Add Security Exception" dialogue box what caused the the issue, I doubt its related to DPi settings. Because if it was, there must be similar issues with other apps too. Whereas I don't see similar issue with the other apps on my machine. May be its some bug in firefox, Can you please check.

Please consider turning on send info to Mozilla before posting a question. This helps us help you.

Please uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved.

Reinstall Current Release Firefox 57.0 with a Full Version Installer https://www.mozilla.org/firefox/all/ Note : Legacy Extensions will be disabled and or removed.

Please let us know if this solved your issue or if need further assistance.

I believe you are referring to below option in the settings: == "Allow Firefox to automatically send technical and interaction data to Mozilla" == This has always been turned on in my firefox.

Will try updating firefox. Thanks.

By the way, I had been using Firefox 56.0.2 (64 bit) version.

Charan1 said

I believe you are referring to below option in the settings: == "Allow Firefox to automatically send technical and interaction data to Mozilla" == This has always been turned on in my firefox. Will try updating firefox. Thanks.

No data came, usually means is turned off. Usually also get Flash version but not this time.

Sorry yes you had 56...

BEFORE UPDATING You need to go through your list of Extensions 1 by 1 and google them and find the Firefox Extension page for each and look to see if they are Firefox Version 57 compatible. Note : Legacy Extensions will be disabled and or removed when it updates soon, hours or days.

Can use google search terms : Firefox Extension <old extension name> Comparable

I have tried all of these solutions for waterfox (firefox is too slow and locks up too much) and none of them work. Also the "add exception" button rarely appears and when I try to do by going through options I get the problem described in this thread. I have also tried putting "chrome://pippki/content/exceptionDialog.xul" in the dialog box. All it does is enlarge the browser so that the bottom of the page is obscured. My IT guy says the problem is not on their end. The company uses Symantec for protection. Chrome and IE open webpages just fine.

If you use an ultra-high resolution display, and especially if you have two displays with very different resolutions, this could be a bug with how Firefox sizes dialogs in that situation. But otherwise:

Sometimes the settings file that stores window and dialog dimensions becomes corrupted with nonsensical values. You can rename the file to restore the defaults. (Or use the Refresh feature if you don't like messing with files...)

Open your current Firefox settings (AKA Firefox profile) folder using either

• "3-bar" menu button > "?" Help > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter/Return

In the first table on the page, on the Profile Folder row, click the "Open Folder" button. This should launch a new window listing various files and folders in Windows Explorer. (On Mac, it's "Show in Finder" and opens Finder.)

Leaving that window open, switch back to Firefox and Exit/Quit, either:

• "3-bar" menu button > Exit/Quit
• (menu bar) File > Exit, or Firefox > Quit

Pause while Firefox finishes its cleanup, then rename xulstore.json to something like xulstoreOLD.json. If you see a file named localstore.rdf, rename that one to localstore.old.

Start Firefox back up again. Do windows and dialogs display at normal sizes again?

That mini-reset will hide the menu bar and bookmarks toolbar, so if you want those back:

You can use one of these methods to show the toolbar list and select the desired bars there:

• right-click (on Mac Ctrl+click) a blank spot on the tab bar (or the "+" button)
• (menu bar) View > Toolbars
  On Windows, tap the Alt key to activate the menu bar temporarily.
• in Customize mode > Show/Hide Toolbars (see: Customize Firefox controls, buttons and toolbars)

To turn on the Bookmarks Toolbar, Menu Bar, or other bars, click it on the list.

Thanks. That fixed the size of the popup.