2043290 - Allow merging PDFs by dragging and dropping a PDF file into the sidebar

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, enhancement)

Description

[Marco Castelluccio [:marco]]

Release Note Request (optional, but appreciated)
[Why is this notable]: A new way to merge PDFs, feature which was released recently.
[Affects Firefox for Android]: No
[Suggested wording]: It is now possible to merge multiple PDFs by draggin a PDF in the PDF sidebar.
[Links (documentation, blog post, etc)]:

Comment 1

[Marco Castelluccio [:marco]]

Attachment: [mozilla/pdf.js] Allow merging a PDF by dropping it onto the thumbnail viewer (#21306)

Comment 2

[Pascal Chevrel (relman team) -> :pascalc]

Note added to our 153 nightly release notes in the New section with this wording:

It is now possible to merge multiple PDFs by dragging a PDF in the PDF sidebar.

I am keeping the relnote-firefox? flag set until we include this note in our final 153 release notes, thanks.

Comment 3

[Timea Zsoldos [:tzsoldos], Desktop QA]

Verified on latest nightly Firefox 153.0a1 (2026.06.02) across platforms.

Comment 4

[Pascal Chevrel (relman team) -> :pascalc]

I am keeping the relnote-firefox? flag set until we include this note in our final 153 release notes, thanks.

(Change of internal process)