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about:support shows a list of ad-ons I was unaware of. Are these preinstalled?

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I visited about:support for the first time today, and I notice a list of Add-ons I was unaware of (i.e. I did not installed these), and I have questions.

Some of these made me think about the search shortcuts I see in Firefox's search setting:

amazondotcom@search.mozilla.org bing@search.mozilla.org ddg@search.mozilla.org ebay@search.mozilla.org google@search.mozilla.org wikipedia@search.mozilla.org

Are these preinstalled in the Firefox browser? What is their function? Are the search shortcuts and these add-ons associated?

Thanx

I visited about:support for the first time today, and I notice a list of Add-ons I was unaware of (i.e. I did not installed these), and I have questions. Some of these made me think about the search shortcuts I see in Firefox's search setting: amazondotcom@search.mozilla.org bing@search.mozilla.org ddg@search.mozilla.org ebay@search.mozilla.org google@search.mozilla.org wikipedia@search.mozilla.org Are these preinstalled in the Firefox browser? What is their function? Are the search shortcuts and these add-ons associated? Thanx
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cybertrapped said

Some of these made me think about the search shortcuts I see in Firefox's search setting: amazondotcom@search.mozilla.org bing@search.mozilla.org ddg@search.mozilla.org ebay@search.mozilla.org google@search.mozilla.org wikipedia@search.mozilla.org

They are the default Search Engines that comes with your language locale of (desktop) Firefox. https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox

Some locales may have another search engine as the main default like Yandex in Russia, Turkey, Belarus and Kazakhstan and Baidu in China. https://blog.mozilla.org/en/products/firefox/firefox-features-google-as-default-search-provider-in-the-u-s-canada-hong-kong-and-taiwan/

Mozilla did try and get away from having Google as the main default by going with Yahoo. However it ended with Mozilla and Yahoo in a legal battle and is why Yahoo has not been a included search engine since the Fx 57.0 Release. /forums/contributors/712925

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