Adobe Acrobat Professional Portable Gratis

I'd like to use Opera browser on my iPad.
I've downloaded Opera Mini.
If I go to the 1Password extension page, it offers to install the Safari extension, although I am using Opera.
If I then click 'Show all extensions' and Opera - Install, I get a page of instructions that flashes by in about half a second, then a link to 1Password-4.6.2.90.crx
If I click on that, something flashes in the top left corner for about a quarter of a second.
But then nothing else happens - I am just left looking at the link.
I have tried this several times, with the same result.
What is going wrong please?