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About this Add-on
Good luck and happy video blocking!
Since version 5.2.2, the add-on is using the new add-on framework called Web Extensions, which is what all Firefox add-ons will be ported to in the (near) future. However, unfortunately and unexpectedly, the storage of the old framework is not linked to the new framework, causing your lists to be empty after the update.
Luckily, your list is not gone yet. You can downgrade the add-on to version 2.0.1 via the add-on version page. In that version, your list should be back and you can export it. The exported file can be imported again in version 5.2.5 (which can be installed manually or will be automatically available in a few days).
If you are not able to make an export because the icon is not visible in the browser, you can do the following:
1. Go to the path on your computer "%appdata%\Mozilla\Firefox\Profiles"
2. Open the folder in there (if multiple folders are in the profiles folder, do the next step for each profile folder).
3. Go to 'jetpack > jid1-3OQ5HY7YsLBV7Q@jetpack > simple-storage' and import the store.json file you find in there in version 5.2.5 of the addon.
This extension is also available for other browsers!
Google Chrome: https://chrome.google.com/webstore/detail/video-blocker/jknkjnpcbbgcbdbaampbjlhkcghmgfhk