If you want to restore the previously used standalone window to manage search engines then you can toggle this pref to false with a middle-click on the about:config page.

about:config page: browser.search.showOneOffButtons = false

You need to close and restart Firefox to make this work properly.

In the address bar, type about:preferences#search<enter>

If you miss being able to switch search engines without going crazy with menus, try this out;

Context Search {web link} Expands the context menu's 'Search for' item into a list of installed search engines, allowing you to choose the engine you want to use for each search.

FredMcD said

If you want to restore the previously used standalone window to manage search engines then you can toggle this pref to false with a middle-click on the about:config page. about:config page: browser.search.showOneOffButtons = false You need to close and restart Firefox to make this work properly.

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In the address bar, type about:preferences#search<enter>

If you miss being able to switch search engines without going crazy with menus, try this out;

Context Search {web link} Expands the context menu's 'Search for' item into a list of installed search engines, allowing you to choose the engine you want to use for each search.

I want to type in URL bar and for it to use teh google I feel lucky feature. it used to do this by default and his did not change that back to that feature.

Change the setting making Google you primary search engine.