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So, weird #Ubuntu/#Gnome/#Firefox question:

Any time I open a TTF or OTF in Fonts to install it, all of Firefox's tabs suddenly want to consume as much CPU as possible across all cores, complete with revving fan.

This has been happening for about a week. It happens even before I click the Install button in Fonts. I can close the tabs (or the browser window) normally or through htop; it doesn't make a difference. Opening Firefox with Fonts already open doesn't cause this.

Any ideas?