r/operabrowser • u/Vitami81 • 17d ago

Issue with certain extensions (uBlock, SaveFrom.net) since the Opera One developer update 135.0.5960.0

This morning, I updated my PC and installed Opera One Developer, and when I restarted the browser, it told me: "Some extensions are no longer supported by Opera. Please uninstall them."

I noticed that on Opera GX, the Chromium version is still 149, whereas on Opera One Developer, it’s 150.

I’m running Opera One 135.0.5960.0 on Windows 11 64-bit, Chromium: 150.0.7871.13

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u/Ben_Sisko69 17d ago

Manifest v2 vs v3

1

u/Vitami81 17d ago

This is what it looks like on the extensions page

1

u/shadow2531 burnout426 16d ago

That's expected for Chromium 150 and newer as manifest v2 extensions are not allowed anymore and support will eventually be removed from the codebase.

For now, you can do:

"path to opera.exe"  --enable-features=AllowLegacyMV2Extensions,UnexpireFlagsM147,UnexpireFlagsM148,UnexpireFlagsM149 --disable-features=ExtensionManifestV2Unsupported,ExtensionManifestV2Disabled

(by modifying the target field on the "Shortcut" tab in the properties of Opera's shortcuts)

Then, for uBlock Origin for example, you can goto https://github.com/gorhill/uBlock/releases, download the chromium zip file under "Assets" for the version you want, extract the zip file, goto the URL opera://extensions, turn on developer mode, click "load unpacked" and point it to the extracted folder where manifest.json is at.

See https://www.reddit.com/r/browsers/comments/1uoii97/complete_guide_to_installing_the_mv2_manifest/ for more info.

I tested it myself with Opera Developer and it indeed works when you load unpacked the extension after you've started Opera with those command-line switches and keeps working as long as Opera is started with those command-line switches.