is an HTML code indicating a non-breaking space. What Firefox should display is a space, not the code. (Unless you are viewing it in an editor.) In a recent report, it was determined to be related to a setting in NoScript, but your extensions list doesn't mention NoScript. ([https://support.mozilla.org/questions/999330 Why do Web pages show nbsp; througout pages after last update?]) In case one of your extensions ''is'' involved, could you test in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]]. You can restart Firefox in Safe Mode using either: * "3-bar" menu button > "?" button > Restart with Add-ons Disabled * Help menu > Restart with Add-ons Disabled Not all add-ons are disabled: Flash and other plugins still run After Firefox shuts down, a small dialog should appear. Click "Start in Safe Mode" (''not'' Reset). Any difference?

Disabling HP Smart Print worked but the strange thing is that the error only occurred on one machine out of several running smart print.