You do have your internet secured with a password, right? If it is a hard to guess password you should be fine.

That is the auto complete option.

Turning off Autofill in Firefox

1. Click on the Firefox menu icon. (Three lines at top right of screen.)
2. Click on Options.
3. Choose the Privacy icon.
4. In the History section choose Firefox will: “Use custom settings for history.”
5. Uncheck “Remember search and form history.”
6. Click OK.

On the wifi list you should see if it says secure. You should have yours say wpa2 for security. If you see that you are good. Just seeing other names in the wifi list doesn't mean they can get in your computer.

I seem to just make things worse. All mine says is internet 5 connected. Plus when I do the autocomplete like you say, raven, it still doesn't change it. There's no button to click for OK. So next I try to do the Firefox for auto suggest, I cannot for the life of me find the Firefox icon. If I can find it, maybe I can get that part changed. Have to go for now. Will check back later.

Try a different browser and see if same outcome. Last resort, check key board to see if "gunk" is stuck between keys....just turn upside down and shake.