If you proceed: Download Firefox Portable 56.0.2, install the 9.0.3 .xpi as a temporary add-on, and isolate the environment. Treat it like a vintage race car—incredible power, no modern safety features, and a high risk of crashing if you push it outside its tiny, pre-defined track.

The Legacy of iMacros for Firefox 9.0.3: Why This Specific Version Still Matters

To run iMacros 9.0.3 , you must use Firefox 56.0.2 (the last pre-Quantum version). Not Firefox 9. Otherwise, the APIs won't match.

Before spending hours hunting for the file, try rewriting your most complex macro in Python with pyautogui + selenium . You will save yourself a world of future security headaches. Disclaimer: This post is for educational and legacy support purposes. Running outdated software connected to the internet poses significant security risks. Always prioritize updated, supported software.