Using Safari on a Mac: flashes + crashes

[thecontinium]

I have used the plugin with both Safari and Firefox on a Mac with multimarkdown ( installed by homebrew )

let g:markdown_composer_external_renderer='multimarkdown'

With Safari the browser flashes ( especially bad when an image is in the document ); setting the refresh rate makes little difference. Also after a while the Safari tab disappears and there is a channel error in nvim.

I have none of these issues when I let g:markdown_composer_browser='open -a Firefox'
No flashes and no sudden closure of tabs.

[thecontinium]

I have now seen the channel error using Firefox; tab stays open.

multimarkdown is not throwing any error when run independently on the markdown file.

The errors in nvim are:

Error detected while processing function 90_markdownHandler[2]..90_sendBuffer:
line 4:
E475: Invalid argument: Channel doesn't exist

If you would like me to explore further; look at log etc please let me know.