By default, the tab or window title bar will display what is listed as the title in the page itself. I'm not aware of a setting to make it display the Name of the corresponding bookmark, although that would be a handy feature. Were you maybe using an add-on for that?

In thinking about how to accomplish your objective, I have to wonder why you load sites that you know to be untrustworthy in the first place? Would it be an option to just completely block them? I suppose they might have some value as information resources so you want to be able to read them...

It is possible I had an addon performing that task (I recently switched back to firefox after a 6+month absence). That said, I did see the description "SCAM" appear on the tab earlier today as I was testing the browser, only to immediately disappeared when I tried to jump from another web site to the one in question. After that, I couldn't replicate the even partial compliance to display the custom name again...

With regards to why I have them bookmarked - it is for the reason you noted above: while I won't order electronics from this vendor due to their horrendous reputation of sending DOA electronics and making customers pay shipping to get their money back, it is still a source of info and pricing for use in comparisons. I'd also like to be able to modify the name of sites who have a good reputation or I have used in the past...

There might be another way to do this. For example, you might be able to modify the page in a manner that provides a more visible warning or deactivates buttons. Imagine a yellow warning bar below the toolbar area saying "DO NOT SHOP" or all buttons having a red background, etc. If there is no extension available that does this, someone could write a custom userscript...

You can look at this extension:

• TabRenamizer2: https://addons.mozilla.org/firefox/addon/tabrenamizer2/