How Do I Stop "T-Mobile Website Suggestions"?
This problem started on July 6, 2014. I called T-Mobile, and they have concluded it was an issue with Firefox.
Whenever I enter a keyword in the top search bar, instead of going to the default search engine (Google, Bing, etc.), it re-directs to a site called "T-Mobile Website Suggestions"... lookup.t-mobile.com . This is a site apparently unfamiliar to T-Mobile tech support, so it could be some sort of malware hidden in either the phone or browser. But I want to disable this re-direct, so I can go to the proper search engine, selected in Settings. (I only get this problem on Firefox. Other browsers still go to the proper search engine.)
Thank you much.
Opaite Mbohovái (2)
Does this problem occur with all searches or only one-word searches?
The One-Word Search Issue
When you enter a single word in the address bar (whether it's puppies or mozilla.org) and tap "Go" Firefox will first check whether it is a valid web server name. Some DNS service providers do not tell the truth and instead serve a page of search results.
If that is the situation, check the results page for an opt-out option. If you do not have one, you could try changing your DNS service provider (for example, in your wifi router settings on a network you control), or get used to tapping the Google (or other preferred search engine) icon in the drop-down that appears while you are tapping out your query.
I'm not aware of a way to force one-word queries to go through a search engine, although someone might have developed one.
Probably a good idea to also scrutinize your add-ons in case one of them has caused this change.
menu > Tools > Add-ons
This is the issue that jscher2000 identified. However you can directly click on the search engine item in the list to bypass the tmobile error page.
Unfortunately tmobile (and many other companies) abuse a part of the DNS spec called NXDOMAIN. This causes Firefox to get results from one word searches from tmobile.