I suggest starting with the built-in password manager. You can clear saved logins you no longer want here:

Mac: "3-bar" menu button (or Firefox menu) > Preferences Windows: "3-bar" menu button (or Tools menu) > Options

In the left column, click Security. Then on the right side, find the "Saved Logins" button.

Are the obsolete ones listed and, if so, can you delete them successfully?

Yes indeed they are, thank you very much Mr jscher2000.

K

A different slant on this question:

I had this question, and my search-engine inquiry took me to: https://support.mozilla.org/en-US/questions/962690#answer-447779

At that link, I find these instructions:

1 click the (empty) input field on the web page to open the drop-down list
2 highlight an entry in the drop-down list
3 press the Delete key (on Mac: Shift+Delete) to remove it  

I followed those instructions to the letter, and was unable to remove anything. Here's why: There are two different senses of the word "highlight". If I use the mouse to roll over those username entries, the entry under the arrow "highlights". Yes, the highlighting is gray - but it distinguishes that entry from the others - another sense of the word "highlight". When I press Shift + Delete in this case, the entries disappear, but remain unmodified.

Note that these instructions say nothing about using the down arrow key - which is required to "highlight" [in the technical sense] the entry so that it can actually be removed with the final keypresses. The advice on this linked page should be changed to add the use of the down arrow key to the process. Please help us out by changing the instructions!

contrawise said

Please help us out by changing the instructions!

That old thread is locked. Perhaps a moderator could update it. Or you could start a new thread, reply to yourself with the complete instructions, mark your reply as the solution, and hope that users find that in future searches.

You need to use the keyboard cursor Down key to highlight the entry in the drop-down list. In current Firefox releases using the mouse to highlight no longer works because this doesn't select the entry. Using the keyboard to highlight and pressing Delete (Mac: Shift + Delete) should still work.

cor-el said

You need to use the keyboard cursor Down key to highlight the entry in the drop-down list. In current Firefox releases using the mouse to highlight no longer works because this doesn't select the entry. Using the keyboard to highlight and pressing Delete (Mac: Shift + Delete) should still work.

Thanks for your reply. I apparently wasn't able to make myself clear. Let me try again ...

I am now well aware of how to perform this task, and was also at the time of my post. That's not the problem I'm trying to bring up.

I'm trying to explain that, when trying to solve this for myself, the internet search engine's top hit was a Mozilla Support page. YAY! That is just as it should be! However ...

Unfortunately, that page gave me misleading/incorrect/incomplete information. I had to go elsewhere to learn the correct procedure. Is that what Mozilla Support wants from its first-hit Support page? Lordy - I hope not! The problem is that the page needs to be corrected!

jscher2000 said

contrawise said

Please help us out by changing the instructions!

That old thread is locked. Perhaps a moderator could update it. Or you could start a new thread, reply to yourself with the complete instructions, mark your reply as the solution, and hope that users find that in future searches.

Here's how to delete unwanted username suggestions and email address suggestions at login boxes: 1 Click on the empty username input field on the web page to open the drop-down list. 2 Using the keyboard's cursor down key, highlight an entry in the drop-down list. 3 Press the Delete key (for Mac: Shift+Delete) to remove it.

That old thread you mentioned is from 2013 and at that time these instructions still worked. It is only recently that hovering with the mouse stops working and only using the keyboard works. Best is always to find recent posts that apply to a problem to get updated instructions in case older instructions do not work. We can't update replies each time the steps posted to fix an issue stop working because of changes in Firefox.

cor-el said

That old thread you mentioned is from 2013 and at that time these instructions still worked. It is only recently that hovering with the mouse stops working and only using the keyboard works. Best is always to find recent posts that apply to a problem to get updated instructions in case older instructions do not work. We can't update replies each time the steps posted to fix an issue stop working because of changes in Firefox.

I did my best, via searching the Support Forums, to do just that. My searches found no recent posts that asked exactly the question I was asking, though they were questions that were related. Those problems were also solved differently. So I added my question, with the correct solution, to those threads. Problem partially solved.

The thing that has me baffled is that the particular post that misled my efforts appeared to be carefully selected and set out as a 'best answer' by a support moderator in the past. If the best solution for me is to find recent posts, why bother doing such a selected posting? Finding that post actually distracted me from looking for more recent posts for a while. And the practice would appear to push the more recent solutions down in the results. I actually got the correct information by finding oblique mention of it at a non-Mozilla support forum, and luckily was able to put the whole picture together.