I was finally able to get it to appear by opening a fresh cookie profile in FF31, logging in with a buyer ID, and loading https://www.ebay.com/mys/active?MyEbayBeta&CurrentPage=MyeBayNextSelling
which immediately popped up the grayed out selling screen with a big while modal dialog on top.
(I didn't try dismissing it since I wanted to destroy it myself).
I think the key to getting it to appear is using a fresh account - it looks like eBay finally might have gotten it right this one time and once an account sees it and clicks through it doesn't appear again. Maybe.
If that is the case, it may be cookie based, but I'm not going to test that yet as I don't want to lose access to the modal dialog by clicking through if it isn't cookie based and goes away permanently before all questions about getting rid of it are resolved. (IF it is a cookie thing, MIGHT be possible to get rid of it with a cookie if that cookie isn't tailored to a specific account and is generic. Although for others to use that approach installation of cookie tools would probably be required..... 🙂
This Adblock Plus Rule takes care of it:
ebay.com/mys/active##div.welcome-screen-modal-wrapper.me-dialog.dialog.dialog--mask-fade
That rule is probably specific enough that it won't wipe out other wanted dialogs.
(which can happen with other annoyances where eBay didn't use such detailed element class and ID attributes - the others usually have no attributes to filter on)
────────────────────────────────────────────────────────
For testing or playing around, the rule can be applied in the following form manually using the built in FireFox Web Developer Style Editor by just opening the style editor (Shift-F7 in FF31 unknown in others) while the dialog is blocking the page, and typing the following into a blank space after any of the displayed CSS rulesets there:
div.welcome-screen-modal-wrapper.me-dialog.dialog.dialog--mask-fade{display:none !important;}
(don't need the domain modifier since we are applying it to the target page, and the web developer console doesn't respect those modifiers anyway - I don't think - they are for Adblock Plus and Stylish syntaxes)
As soon as it is typed or pasted in it applies and the modal dialog goes away. Then just close Style editor.
(note: if the page is reloaded the dialog will come back as the rule was just tacked into one of eBay's stylesheets in the browser, and those refresh on a reload. That is why persistent rule engines like Adblock Plus or Stylish are needed to automate these CSS manipulations. In Firefox, the rule COULD be added to the Firefox usercontent.css file to be persistent without any further interaction being needed
That rule would be (and is also the Stylish/Stylus syntax):
@-moz-document url-prefix ('https://www.ebay.com/mys/active'){
div.welcome-screen-modal-wrapper.me-dialog.dialog.dialog--mask-fade{display:none !important;}
}
Hey, I'm just the mad-scientist engineer they keep locked in the back room. Up to you marketing guys to figure out what to do with it 
Just kidding. Sort of.
Just so there is no misunderstanding: I am using XP on a PC. No ideas about Safari or Mac OS, nor was this tested anywhere but in FF31 where I worked it out. I tossed it out there for others to test, debug, and use if workable.
Your procedure sounds about right, but totally different than my version's.
For my old Adblock Plus v2.6.13 in FF31, I would:
-right click on the red ABP icon in the bottom status bar (or top toolbar if I had that visible)
-choose "Filter Preferences"
-click the "Add Filter" button in that window
-type or paste the one line rule I posted above in the filter field, and hit enter.
Sounds like you can walk the others through this. (I'm always available for clarifications or arcane details as needed - just not much good at explaining the basics 🙂
Actually, a selling account isn't required - my test with my buyer account showed that the page loads anyway.
Just kidding. Sort of.
Just so there is no misunderstanding: I am using XP on a PC. No ideas about Safari or Mac OS, nor was this tested anywhere but in FF31 where I worked it out. I tossed it out there for others to test, debug, and use if workable.
Your procedure sounds about right, but totally different than my version's.
For my old Adblock Plus v2.6.13 in FF31, I would:
-right click on the red ABP icon in the bottom status bar (or top toolbar if I had that visible)
-choose "Filter Preferences"
-click the "Add Filter" button in that window
-type or paste the one line rule I posted above in the filter field, and hit enter.
Sounds like you can walk the others through this. (I'm always available for clarifications or arcane details as needed - just not much good at explaining the basics 🙂
Actually, a selling account isn't required - my test with my buyer account showed that the page loads anyway.
