Re-opens Firefox when rebuilding

[freaktechnik]

A new Firefox instance gets opened when webpack rebuilds the project.

[Parka]

@freaktechnik
Haven't tested it thoroughly but I believe that the code in
WebpackWebExt.prototype.apply

should be replaced by:

WebpackWebExt.prototype.apply = function(compiler) {
  compiler.plugin('emit', (compilation, callback) => {
    if (this.runOnce && !this.webExtRunPromise) {
        this.webExtRunPromise = this.runWebExtCommand();
    } else if (!this.webExtRunPromise){
      this.runWebExtCommand();
    }
    callback();
  });
};

I'll do a PR if I find no issues.

[DannyHinshaw]

@Parka any reason you never opened a PR on this?

[Parka]

@DannyHinshaw I just didn't get to test it enough, but it seemed to be working ok at the time.

[DannyHinshaw]

It worked for a little while until it didn't. At this point I'll just be developing in a different way, for multiple reasons (including this). Just wanted to note my experience here in case others end up here like I did.

Thanks for the reply

[whizsid]

I can confirm this issue and it fixes in #3 .

[marioplumbarius]

Hey @rpl , can you kindly have a look at this PR: #4