YouTube Thumbnail Viewer version history - 6 versions
YouTube Thumbnail Viewer by gifnksm
YouTube Thumbnail Viewer version history - 6 versions
Be careful with old versions! These versions are displayed for testing and reference purposes.You should always use the latest version of an add-on.
Latest version
Version 0.5.1
Released Mar 22, 2026 - 885.19 KBWorks with firefox 58.0 and laterImproved thumbnail update stability- Prevents race conditions that could cause flicker or stale thumbnails
- Limits
tabs.onUpdatedhandling to the current window to reduce unnecessary reloads - Clarifies thumbnail reset/apply flow for more predictable behavior
Source code released under MIT License
Older versions
Version 0.5.0
Released Mar 22, 2026 - 884.78 KBWorks with firefox 58.0 and laterImproved thumbnail fallback reliability- Falls back to valid thumbnails when
maxresdefaultis missing - Prefers Shorts
oar...thumbnails so vertical images are shown when available - Chooses the largest available real thumbnail even if some variants are missing
Source code released under MIT License
- Falls back to valid thumbnails when
Version 0.4.0
Released Mar 22, 2026 - 884.27 KBWorks with firefox 58.0 and later- Improved thumbnail preview reliability for both standard YouTube videos and Shorts.
(Feature enhancement contributed by evrial on GitHub.)
Source code released under MIT License
- Improved thumbnail preview reliability for both standard YouTube videos and Shorts.
Version 0.3.0
Released Jan 30, 2022 - 921.82 KBWorks with firefox 48.0 and laterv0.3.0 (2022/01/30):- Support /live URLs
- (internal change) Thumbnail URLs are now retrieved from OGP metadata when possible instead of video URLs.
Source code released under MIT License
Version 0.2.0
Released Feb 22, 2021 - 957.76 KBWorks with firefox 48.0 and laterv0.2.0 (2021/02/22):- Support YouTube Music
Source code released under MIT License
Version 0.1.1
Released Jun 28, 2020 - 871.12 KBWorks with firefox 48.0 and laterSource code released under MIT License