searchitdown can't be removed from preferences
In Firefox I discovered that under Preferences/Search/SearchItDown can't be removed. I was able to remove it in Safari. SearchItDown is preventing my MAC from shutting down using Apple / Shutdown. I have to now use the button. Also some programs that are open can't be closed unless I use fore quit. I'm on a MACbook Pro using Sierra 10.12.3
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Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control>(Mac=<Command>)<Shift> A)
In the Add-ons Manager, on the left, select Extensions. Remove searchitdown Anything. Now do the same in the computers Programs Folder.
Windows: Start > Control Panel > Uninstall Programs. Mac: Open the "Applications" folder. Linux: Check your user manual.
A running program can't be removed.
Start your Computer in safe mode with networking. Then remove those programs.
Separate Issue; Your System Details shows;
Installed Plug-ins
Shockwave Flash 23.0 r0
Shockwave Flash 24.0 r0
Having more than one version of a program may cause issues.
You must remove the older programs. Then get the current full installer.
Flash: Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac
Then reinstall the latest version.
Note: Windows users should download the active_x for Internet Explorer. and the plugin for Plugin-based browsers (like Firefox).
Note: Windows 8 and Windows 10 have built-in flash players and Adobe will cause a conflict. Install the plugin only. Not the active_x.
Flash Player Version: 24.0.0.194
https://get.adobe.com/flashplayer/ Direct link scans current system and browser Note: Other software is offered in the download. <Windows Only>
https://get.adobe.com/flashplayer/otherversions/ Step 1: Select Operating System Step 2: Select A Version (Firefox, Win IE . . . .) Note: Other software is offered in the download. <Windows Only>
See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration