Firefox Browser compatibility with Selenium IDE and Firebug Plugins or addons.
Selenium IDE & firebug can work on any versions (mostly above v-31.0) of Mozilla FF. both are Firefox plugins so they don't affect on any versions. If you are asking about Selenium WebDriver & ff versions then it may differs from version to version & Selenium java jars. but my perspective IDE & firebug can work on any versions of ff.