@MAK99 the feature is usable through the button in the PDF toolbar right above the popup. You can see the same icon in the pop-up (on the left of "Read and sign docs") and in the PDF toolbar.
@nowhy we already support filling text forms!
The signature feature is being released slowly in Firefox 137, and should be fully released by Firefox 138.
Thanks for the feedback! We have a large number of improvements in the pipeline, we are going to release them soon (likely during the second half of this year).If you have specific examples of errors, that will help us.
