a2er is a free Chrome add-on developed by bastscho. It falls under the category of Browsers and is listed as an Add-ons & Tools subcategory. The main purpose of this add-on is to convert words ending in "a" to end with "er".

With a2er, you can easily toggle the functionality on and off via the button in the extensions list. This means that you have control over when the conversion takes place. It dynamically converts words ending with an "a" or an "a" in the last syllable to end with "er". For example, Wikipedia becomes Wikipedier and Jakarta becomes Jarkater.

It's worth noting that dynamically loading webpages might overwrite the changes made by a2er and revert "er" back to "a". However, you can manually trigger the conversion by pressing ALT+K, ensuring that the desired changes are applied.