Hi, you seem to be using an old version of Firefox (v38) - the latest is v56, which can compromise your security and may cause other problems. To update it, open the 3-bar menu > Help (question mark at bottom right) > About Firefox. Alternatively, you can press the Alt key to bring up the main menu bar > Help > About Firefox. More - Update Firefox to the latest release.

To see the bookmarks bar, right click in the tab bar (but not on a tab) and select Bookmarks Toolbar. Also see - Bookmarks Toolbar - Display your favorite websites at the top of the Firefox window.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

As you are using plugins, you'll need the ESR version, which you can download from here :

https://www.mozilla.org/en-US/firefox/organizations

Separate issue : Your system details show that you are running an old version of Flash, which can cause major problems. So, would you please update Adobe Flash Player :

Uninstaller : https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

Then re-install the latest version, which is 27.0.0.130 You can download te latest version from here : https://get.adobe.com/flashplayer/

Note : some 'extras' may be offered in the download.