Add-on “appears to be corrupt” when trying to install my add-on’s .xpi file in Firefox

The .xpi file must use only “deflate” compression or uncompressed The zip implementation within Firefox only supports uncompressed files or files compressed with the “Deflate” algorithm. You will need to create the .zip archive using the compression method “Deflate” instead of the “LZMA” which you are currently using. How to do so will depend on … Read more