A long left click shows the right click menu

When I hold down the left mouse button, the right click menu appears.
I want to turn off this function, but can't remember which extension controls it or whether the function is built in to Firefox.

Hooray!! Found it! Thank you Google.
I found an old - very old - thread on Mozillazine.org:
http://forums.mozillazine.org/viewtopic.php?f=38&t=340572
And it IS a normal Firefox feature, but is normally OFF.
I think I must have recently turned it on after reading a "Firefox Tips and Tricks" article somewhere.
Anyway, the preference is called "ui.click_hold_context_menus".
And I just remembered that I added it in my "user.js" preferences file, amongst a load of others:
* Disable the Delay When Installing New Extensions
user_pref("security.dialog_enable_delay", 0);
* To turn off the URL greying
user_pref("browser.urlbar.formatting.enabled", false);
* To unhide the "http" portion of a URL
user_pref("browser.urlbar.trimURLs", false);
* Enable spell checker in multi-line text boxes & single-line text boxes
user_pref("layout.spellcheckDefault", 2);
* Double underline style
user_pref("ui.SpellCheckerUnderlineStyle", 4);
* Cycle through open tabs with Ctrl+Tab
user_pref("browser.ctrlTab.previews", false);
* Disable Animations for Full Screen
user_pref("browser.fullscreen.animateUp", 0);
* Click and hold on a hyperlink to show the context menu
user_pref("ui.click_hold_context_menus", true);
* Instant Apply Preferences Without Closing Options Window
user_pref("browser.preferences.instantApply", true);
* Middle-click in any textfield, addressbar or searchbox to paste clipboard
user_pref("middlemouse.paste", true);
So there's a lesson to be learned here: don't add too many tweaks to your Firefox preferences at the same time or you may forget what you did!
Thanks, all. I'll now mark this as "Solved"!

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