Firefox

In Firefox, amo stickers is installed as a userscript: a script run by a script manager. There is no amo stickers extension for Firefox.

Install Tampermonkey. Tampermonkey is a script manager, and amo stickers is tested in it. Install it from Firefox Add-ons: Tampermonkey. Firefox will show which permissions the manager needs, including access to site data — without it the manager can’t run the script.

Install the script. Click the link amo-stickers.user.js — it is the latest version. The manager will offer to install the “amo stickers” script and show its version number — confirm the installation:

• Tampermonkey opens a separate tab with an “Install” button, or, if amo stickers is already installed, with an “Update” button and the installed version number;
• Userscripts in Safari opens the link as text — that’s fine: click the Userscripts icon in the Safari toolbar, and it will offer to install the script.

If the manager didn’t offer anything, check that it is installed and turned on.

What the manager will ask. The script runs only on amo sites (*.amo.tm) and connects to three addresses on its own:

• api.telegram.org — importing packs from Telegram;
• giphy.com and klipy.com — GIF search.

The script has no other addresses. With Tampermonkey, the GIF keys and your own bot token are stored in the manager itself, and scripts on the amo page can’t see them.

Check it. Open or reload the amo tab: a sticker button will appear in the message field next to the emoji button.

Updates are checked and installed by Tampermonkey itself — see “Updating” for details.

Violentmonkey — no guarantees

The script may also work in the Violentmonkey manager, but this way isn’t tested. If something doesn’t work in Violentmonkey, install Tampermonkey following the steps above.