Hi. Thanks for your review. Now I can't fix "file:" bug:

https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs/create
For security reasons, in Firefox, this may not be a privileged URL. So passing any of the following URLs will fail:
chrome: URLs
javascript: URLs
data: URLs
file: URLs (i.e., files on the filesystem. However, to use a file packaged inside the extension, see below)
privileged about: URLs (for example, about:config, about:addons, about:debugging). Non-privileged URLs (e.g., about:blank) are allowed.


But, i am working on it...