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TinyEditor works fine with FireFox.
I don't know what kind of problems you have with TinyEditor under FireFox but I think it's FireFox not being able to copy/paste.
To have the copy, paste and cut options working under FireFox you might have to do the following on a Windows machine:
Open the correct user folder in 'Documents and Settings'.
Open the folder Application Data -> Mozilla -> FireFox -> Profiles -> 'folder with a random name'.
Open the file user.js in a text editor and add the following code:
user_pref("capability.policy.policynames", "allowclipboard");
user_pref("capability.policy.allowclipboard.sites", "http://");
user_pref("capability.policy.allowclipboard.Clipboard.cutcopy", "allAccess");
user_pref("capability.policy.allowclipboard.Clipboard.paste", "allAccess");
Save the file user.js and restart FireFox.
Concerning the plugin, does FireFox tell you what plugin it needs?