manifest.json gecho.id use a better name

[noguxx]

Description

For Firefox to load extensions from /usr/lib/firefox/browser/extensions/ the file must have a name of gecho id and extension xpi. In the case of sidebery is {3c078156-979c-498b-8990-85f7987dd929}.xpi.

Could you rename gecho id to something like sidebery@mbnuqw so the filename would be [email protected] As an example ublock uses [email protected], the filename for ublock is [email protected]