Google Search – How to Change Language from German to English

As you can see in the following picture, firefox's language is German.

Searching for 'google maps' brings as first result www.google.de/map.

What i did was to follow the steps in this tutorial: https://support.mozilla.org/en-US/kb/use-firefox-interface-other-languages-language-pack

1. I have installed the English (US) version of the browser
2. In the add-ons Manager, the Language panel shows English language pack
   
3. When trying to change the language of the user interface, i type about:config in the address bar; searching for ' intl.locale.requested' brings no result

There are other entries such as intl.accept_languages, but the tutorial does not use them. Anyway, this entry is set to English

What can i do about this problem? While the location of my company is outside Germany, the website https://www.whoismyisp.org/ identifies the location of my ISP as a german city.

EDIT: I also tried this approach:

4. I went to https://www.google.co.in/preferences?hl=en, and changed the Region Settings from Current Region to United States. Still the same result

2nd EDIT: several more attempts:

5. I typed 'about:config' in the address bar, I added the entry 'intl.locale.requested' with the value 'en-GB', and I also modified the wifi uri to point to a New York location. I also set 'geo.enabled' to false, but the results are still in german. I did not forget to restart the browser after these changes.

As pointed out here , it appears that websites derive the location based on the IP address. The only way to bypass this is to use a proxy – which might be against my company's policy, and the internet connection is pretty slow already.