Google Chrome will stop accepting updates for add-ons that are running Manifest V2 in June 2022. This add-on will need to be migrated to Manifest V3 to continue to work.
Currently, Firefox does not support Manifest V3, which would pose a slight challenge. However, they are supposed to start accepting Manifest V3 submissions in "early 2022", so it may be possible to wait until then if it becomes an issue of too many required changes.
Google Chrome will stop accepting updates for add-ons that are running Manifest V2 in June 2022. This add-on will need to be migrated to Manifest V3 to continue to work.
Currently, Firefox does not support Manifest V3, which would pose a slight challenge. However, they are supposed to start accepting Manifest V3 submissions in "early 2022", so it may be possible to wait until then if it becomes an issue of too many required changes.