My add-on – Enforce Browser Fonts – lets user configure a website to use website’s own fonts or browser fonts.
It does this by manipulating the extension API browserSettings.useDocumentFonts, which is a global configuration, but the add-on turns it into a per-domain configuration.
The working is simple – activate the extension through its icon or keyboard shortcut, and the fonts are switched instantly.
Instantly, until about a month ago. Now, when the extension is activated, it does update browserSettings.useDocumentFonts correctly immediately, but the current tab does not reflect the new setting.
Through trial and error, I found that the current tab adopts the new setting if its reloaded OR if devtools are toggled.
I’m not aware of an intentional change, but I’ll readily admit I don’t have exhaustive knowledge of all changes
I spent a few minutes looking through Firefox bug reports and so far I haven’t found any bugs that seem related to the issue you’ve described. IF possible, I’d strongly reccomend creating a minimal reproduction example and filing a bug report on the WebExtensions product on bugzilla.mozilla.org.
