Unicode Keyboard - Firefox Add-on
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Add-on summary
The addon provides a simple, keyboard-oriented way to search for and input characters from the raw Unicode Character Database by their official names (such as "SURFACE INTEGRAL"), code blocks (e.g. "Math_Operators") and general character categories ("Sm", i.e. Symbol, Math).
Additionally it can directly substitute a small subset of latex syntax with equivalent unicode character sequences while you type.
Note that this is not a specialized emoji input, while it is easy to enter the basic emoji there currently is no special support for the composite sequences.
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Add-on safety
Risk impact
Unicode Keyboard requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
Unicode Keyboard is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.