You could get Chrome or a variant of it - a nice variety of add-ons work on all of them.
I like SWare Iron.
You can get and [url=https://chrome.google.com/webstore/detail/scriptsafe/oiigbmnaadbkfbmpbfijlflahbdbdgdf?hl=en]ScriptSafe - it works like NoScript and it's easy to manage since you're familiar with NoScript.

Re: your issue with Firefox 21, you could try adding devtools.webconsole.enabled in about:config and set it to false - it might do the trick.

EDIT: typo

I went ahead & installed Firefox21 again & then entered devtools.webconsole.enabled but instead of going in as boolean in went in as string. Now I can't figure a way to edit/delete it.

Ok, I'll walk you through this - you might want to take a couple of notes because you'll have to close Firefox otherwise the changes won't stick.
1. Go into your Firefox profile and find the file named prefs.js.
2. Open it with Notepad (or any text editor you use).
3. Find the entry devtools.webconsole.enabled.
4. Delete that line.
5. Save and exit.
6. Launch Firefox and add devtools.webconsole.enabled as boolean and set it to false.
7. Restart Firefox to see if it did the trick.

If you need anything else I can help you with, reply to this post :-)

Good luck.

Just tried all that & the dang console continues to pop up whenever it feels like it. Bah...guess its time to give Chrome a try.

Thanks for your efforts.

If you're still in the mood to troubleshoot this - it could be a conflict with one or more of your add-ons. May I ask:
1. What add-ons you have installed besides Adblock Plus and NoScript?
2. Have you tried starting Firefox in Safe Mode?
If it works fine in Safe Mode, an effective way to troubleshoot add-on conflicts is:
2.1 Enable half of them - if the problem comes back, it's one or more of the enabled ones. Disable half of them and check and so forth till you identify the culprit.
2.2 If no problem, you enable half of the remaining half ones and so forth until the problem comes back.
Only issue is that when you find the culprit, you'd have to uninstall it.

There's one more thing you could try (even before troubleshooting add-ons):
I. Search for devtools.*.enabled in about:config.
II. You should get the following ones (besides devtools.webconsole.enabled):
-- devtools.debugger.enabled
-- devtools.errorconsole.enabled
-- devtools.inspector.enabled
-- devtools.layoutview.enabled
-- devtools.responsiveUI.enabled
-- devtools.ruleview.enabled
-- devtools.scratchpad.enabled
-- devtools.styleeditor.enabled
-- devtools.tilt.enabled (3D View)
-- devtools.toolbar.enabled
III. Set everything to false.
IV.Restart Firefox to check if it did the trick.

Cheers

I know, people who try to advertise a program whenever something doesn't work are annoying, but I would really recommend Opera.

Even though it's getting worse with each update, it's still the best browser out there.

Best in what way?
I find that it suffers from poor cookie and javascript management and worse, has no decent add-ons to enhance these functions, not to meniton that Opera's add-ons are not kept up to date.
I also find it annoying that userstyles don't work if you disable javascript.

IMHO, It does some things better than other browsers, but is far from the best browser out there.