Is it possible to override browser (firefox in this case) behavior

OP here, sorry for a few typos and shit english, but OneeChan makes it almost impossible to verify what I wrote in this tiny-as-fuck QR window.
If anything is unclear, I'll try my best to explain it.

What is this dumb shit supposed to accomplish?

yes. Add an event listener for document, check if e.target is an HTMLAnchorElement with a src , and if not, do the same check for the parentNode until you reach document, in that case, do nothing.
If you found a link this way, call e.preventDefault and instead show your dialog.

You can do that.
As far as I know there is no way to open a link in a different web browser. You might be able to use a custom protocol (think something like torrent: mailto: or myownshittyhandler: ) and register a program for that in your OS.

>>56495572
There is a way, I believe that you can make system open the link with default web browser for you. There's probably some js call to execute command as system "run" tool does.
I mean in windows, but probably you can do same thing with unix shell.

>>56496188
Holy god no. You wouldn't want that, ever.
If random websites were able to do this, you would be fucked and the disgusting fatbeards who are paranoid about "MUH NUNFREE JABBASHRERPT" actually had ground to stand on.

On internet explorer you can actually do this with an ActiveX object. But that's why you're smart enough not to use that garbage, right?

>>56496378
Common Sense TM says that you're right, but I'm almost certaint that I've seen js code capable of doing so somewhere...

>>56496411
Pretty sure it isn't. But Windows and the unices as well I guess should have a way to register custom programs for custom protocols / URI schemes. After all, when opening a magnet: link, your os will open your torrent client if there is any.

There's probably some mapping in the registry that maps URI schemes to programs to launch.
So as long as you have the computer you're doing this on under your control, you should be able to do this.

>>56492978
you know noscript exists, right?

O'kay.
So, how do I start?
> Add an event listener for document, check if e.target is an HTMLAnchorElement with a src , and if not, do the same check for the parentNode until you reach document, in that case, do nothing.
>If you found a link this way, call e.preventDefault and instead show your dialog.

Anyone is willing to waste 5 minutes of their life and send me a GM script template, or should I /thread and kindly ask uncle Bootnet to help me out?

>>56496606
yes, what would it change?
I want my browser to stop opening urls that I click if they're leading to another page.

I'm not sure if I understand you correctly.
You want one browser for normal websites, and one browser (with specific - I assume security related - behavior) for specific websites to download your child porn and order your drugs.
And you make the decision which link opens in which browser based on individual, manual choice, right?

So why not just install 2 browsers and bind a key (middle mouse button for example) or a menu entry to "open in that other browser"?

Or am I misunderstanding you and there's some sort of automation or link-recognizing?

>>56496757
That's right, but....
...it opens the selected browser wth a link
Not the link in selected browser. So for second one I'l get the warning that this browser is already running.
Also, I want this to prevent me missclicking some random shit on websites. As I said, I can just drag-drop links to another browser profile, that's what I'm doing now. But some mechanism that would prevent them from opening if I accidentially click on them would be nice.

>>56496860
Whitelist?

>>56496877
Yeah, used it for a while, but every time I was trying to open some page that wasn't whitelisted I was literally getting cancer from visiting about:addons, goind to settings and manually creatnig new rule. There's no good whitelist addons for firefox I know about.