Blank editor + broken buttons root cause: index.js was writing the
capture to <userData>/addons-data/screenshot-scratch/<name>.png and
passing "?src=file://<that path>" to editor.html. The editor lives at
file:///<userData>/addons/screenshot/editor.html — different directory
tree under file://. Chromium's file:// origin policy treats those as
different origins and quietly refuses the <img> load, so init()'s
loadImage() rejects, the canvas never gets an image, and every tool
after that operates on a still-empty 300×150 default canvas — the
tools appear to work but produce no visible output because the base
image never landed. The sidebar version we replaced set
`previewImg.src = dataUrl` (a base64 data URL) directly, which has no
origin and just worked; the tab version regressed by adding the file
hop.
Fix keeps the scratch file for the recent-captures ring but hands
the raw capture through the add-on's per-add-on kv store
(`__pending` key). Same store, same origin scoping, no
cross-directory read: index.js writes via api.storage.set from main;
editor.js reads via window.silentmode.storage.get through the tab
preload (packaged since 0.3.27). Fallback path retained for
"openRecent" callers still passing ?src=… — those will need their
own fix in a follow-up.
Bumped to 0.2.4 and signed for the OTA endpoint — first real
independent add-on ship: no Theseus release needed to fix this,
0.3.27 installs pick up 0.2.4 via the boot-time signed-update poll.
2e42783dfe