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Not necessarily. Start with smallest impact, and build on it. There's a lot of places the error could be introduced. If you run addons, and disabled them for the test, start adding them back one at a time. If all that works, delete the site cookies for this forum. You shouldn't lose anything...

Using any javascript tools, or anything that interacts with web js libraries? Try a private window with all addons disabled.

Works for me. Maybe try restarting your browser?