Since Firefox 34.0.5 update, I lost all my search engines in search bar and can not change the settings.

No research don't engines see the upward into the search bar. All are checked in the settings dialog, and I can check or uncheck the.

Please see this article to learn how to work the new features of the search bar.
https://support.Mozilla.org/en-us/KB/search-bar-add-change-manage-search-engines-Firefox

The main thing that threw me, is that you must type at least a letter for a search in the search bar to see the drop down menu which allows to open when you click mini - image search icon in the search bar.

You can return to the former system like this.
Open Subject: config (typed in the address bar) and turn this false preference
browser.search.showOneOffButtons
Then restart Firefox.

Tags: Firefox

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