...
Note that in Internet Explorer spell checking often autocorrects words as you type (e.g. if you time speltt your IE browser will change this to spelt).
Moziller Firefox
https://support.mozilla.org/en-US/kb/how-do-i-use-firefox-spell-checker
Karen, here are several 3rd party dictionary plugins for Web Browsers. You need to evaluate them to determine if they meet your requirements. If they don't we'll need to spend more time editing them or making a custom dictionary. Or you may want to talk to the publishers of the Macquarie Dictionary and see if they have a web browser plugin.
...