On Firefox 90.0.2 (64-bit) on GNOME 40.3.0 on X11, most recent Manjaro x64.
Open Browser Console (Ctrl+Shift+J). It will have plenty of following two errors:
Error: Please use $(ref:runtime.getURL). 5 content_script.js:369
V moz-extension://931f784e-995b-4c16-8be5-55add225aa99/content_script.js:369
Error: Please use $(ref:runtime.getURL). content_script_tooltip.js:11
782 moz-extension://931f784e-995b-4c16-8be5-55add225aa99/content_script_tooltip.js:11
On Firefox 90.0.2 (64-bit) on GNOME 40.3.0 on X11, most recent Manjaro x64.
Open Browser Console (Ctrl+Shift+J). It will have plenty of following two errors: Error: Please use $(ref:runtime.getURL). 5 content_script.js:369 V moz-extension://931f784e-995b-4c16-8be5-55add225aa99/content_script.js:369 Error: Please use $(ref:runtime.getURL). content_script_tooltip.js:11 782 moz-extension://931f784e-995b-4c16-8be5-55add225aa99/content_script_tooltip.js:11
That comes from WorldBrain/Memex extension:
Thank you in advance for fixing.