Provide version 0.99 for migration

[piroor]

We need a migration path.

• "Firefox 57" problem:
  • Many APIs which TST depends on are available only on Firefox 57 and later.
  • Embedded WebExtensions is not available on Firefox 57 and later.
• "Bootstrapped Extensions" problem:
  • Embedded WebExtensions can be shipped only as a part of Bootstrapped Extensions.
  • There is no resource to re-develop TST as a bootstrapped extension.

So now I'm planning to develop a version 0.99 just designed for migration. It will:

• A bootstrapped extension with embedded WebExtensions.
• The "outside" simply sends configuration and structure of existing tabs to the "embedded" via the messaging API.
• "Embedded" will store the information to the local storage.

After that the version 0.99 will be updated to renewed WebExtensions version 2.x via auto-update. Then the updated version will read migration data from the local storage and complete migration based on the information.

[piroor]

See also https://github.com/piroor/treestyletab/issues/1340#issuecomment-327016191

[piroor]

Now manual migration feature is landed. In legacy version you can export configurations and tree to files. On the other hand, you can import them manually on the WE version.

[piroor]

I close this because outdated.