This used to be one of the best add-ons I ever found for Firefox. But sometime in August, the Status Bar display for the word and character count suddenly quit working. I don't know if the problem is due to an update to Firefox, or an update to WCT, but I can no longer get the Word and Character Counters to show up in the either the Menu Bar or the Status Bar. In Firefox's "Customize" menu, I can't even find an icon for Word Count Tools anymore, yet a check of "Tools - Add-ons" shows that it is installed and enabled. Whatever, I can't make the Status Bar display work anymore. Hopefully the author will be able to fix this problem on a future release. I assume this is some kind of compatibility issue with Firefox. I like Firefox, except for it's annoying tendency to come out with updates that "break" some of my favorite add-ons. If this problem gets solved, I'll update this review back to 5 stars, because I really liked WCT, back when it was fully functional.
The good news is, the pop-up dialog box display is still working. To use this, highlight a section of text on the web page, right-click, and look down toward the bottom of the Context Menu for "Word Count Tools Shift+Alt+C". Clicking on this this menu item with either the left or right mouse button brings up a dialog box that displays the statistics of the selected text. You then have to click "Dismiss" or hit the "ESC" key to kill the dialog box when you are done with it. Unfortunately, this dialog box appears to be hard-coded to pop up in the center of the screen; there does not appear to be any way to move it to some other part of the screen or to a second monitor if you have a dual-monitor system (as I do).
I have found that Word Count Tools does not work with one of my other Firefox Add-ons, the Simple Text Editor by "kud" [https://addons.mozilla.org/en-US/firefox/addon/simple-text-editor/]. This is a Firefox Browser add-on, which provides simple plaintext editing. But for some reason, the process of selecting a block of text in this Editor window, then pulling op the Word Count Tolls dialog box, is not fully functional. The dialog box pops up, but the statistics are not displayed. The Character count is "1", all other statistics are "0", no matter how many characters are selected.
Because of the disabling of the Status Bar/Menu Bar display, and the apparent compatibility problem with kud's Simple Text Editor add-on, I am giving WCT 4 stars instead of 5. If these two issues can be corrected, I will upgrade this review to 5 stars.