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Browser Extensions · head to head

FireMonkey vs HashiCorp Vault

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
HashiCorp Vault logo

HashiCorp Vault

Cybersecurity

Manage secrets and protect sensitive data

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: FireMonkey firefox only, and requires a recent one: version 93 on desktop, 113 on Android.; HashiCorp Vault policies are written in HCL with no graphical user interface for policy management or editing
  • They diverge on capability: FireMonkey covers Scripts and styles together, HashiCorp Vault covers Secret storage.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and HashiCorp Vault actually diverge.

Attributes where FireMonkey and HashiCorp Vault differ
AttributeFireMonkeyHashiCorp Vault
PlatformsFirefoxLinux, Windows, Mac, Api
CategoryBrowser ExtensionsCybersecurity
FoundedUnknown2014

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in FireMonkey

  • Scripts and styles together
  • Monaco editor with ESLint
  • Unlimited client-side storage
  • Global injection
  • Notifications and clipboard
  • Firefox for Android

Only in HashiCorp Vault

  • Secret storage
  • Dynamic secrets
  • Encryption as a service
  • Identity-based access
  • Audit logging
  • Leasing and renewal
  • Secret engines
  • Auth methods

What people use each for

The jobs each tool is most often brought in to do.

FireMonkey

  • Running user scripts and user styles without two separate extensionsnot HashiCorp Vault
  • Restyling sites with CSS alongside scripted behaviour changesnot HashiCorp Vault
  • Editing scripts in a full editor inside the browsernot HashiCorp Vault
  • Injecting CSS globally across every sitenot HashiCorp Vault
  • Managing a mixed library of scripts and styles from one dashboardnot HashiCorp Vault

HashiCorp Vault

  • Secrets managementnot FireMonkey
  • Database credentialsnot FireMonkey
  • API keysnot FireMonkey
  • SSH accessnot FireMonkey
  • PKI and certificatesnot FireMonkey

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

FireMonkey

  • Firefox only, and requires a recent one: version 93 on desktop, 113 on Android.
  • Not a drop-in replacement for Greasemonkey, Tampermonkey or Stylus. The project says so itself, so an existing library may need adjusting.
  • A much smaller user base than Tampermonkey or Violentmonkey, which means fewer people have hit the bug you are about to hit.
  • No Chrome, Edge or Safari build, so it cannot be the answer for anyone working across browsers.
  • Combining scripts and styles in one extension also combines the blast radius: one extension with permission to inject both into every page.

HashiCorp Vault

  • Policies are written in HCL with no graphical user interface for policy management or editing
  • Unsealing requires managing multiple key shares and coordinating a quorum of operators
  • Community Edition lacks enterprise features like namespaces and disaster recovery replication
  • Requires additional monitoring solutions for alerting and observability

Pricing, plan by plan

FireMonkey

Free
  • Open sourceFree
    • MPL-2.0 licensed
    • Unlimited scripts and styles
    • No account required

HashiCorp Vault

Free
  • Open SourceFree
    • Secrets management
    • Encryption
    • Community support
  • Vault Enterprise$6000/year
    • Replication
    • HSM support
    • Advanced audit

Which should you pick?

Choose FireMonkey if

  • You need scripts and styles together.
  • You want to start without paying.
  • You work on Firefox.
  • You also want monaco editor with eslint.
FireMonkey review

Choose HashiCorp Vault if

  • You need secret storage.
  • You want to start without paying.
  • You work on Linux, Windows, Mac, Api.
  • You also want dynamic secrets.
HashiCorp Vault review

Questions people ask

Is FireMonkey or HashiCorp Vault better?
Neither clearly leads. FireMonkey starts at Free and HashiCorp Vault at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or HashiCorp Vault?
FireMonkey starts at Free and HashiCorp Vault at Free.
Does FireMonkey or HashiCorp Vault run on more platforms?
FireMonkey runs on Firefox. HashiCorp Vault runs on Linux, Windows, Mac, Api.
Can I use FireMonkey for free?
Both have a free tier, so you can try either at no cost before committing.
What is FireMonkey best used for?
FireMonkey is most often used for running user scripts and user styles without two separate extensions, restyling sites with css alongside scripted behaviour changes, editing scripts in a full editor inside the browser, injecting css globally across every site. Of those, running user scripts and user styles without two separate extensions and restyling sites with css alongside scripted behaviour changes are not what HashiCorp Vault is typically brought in for.
What can FireMonkey do that HashiCorp Vault cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. HashiCorp Vault covers Secret storage, Dynamic secrets, Encryption as a service, Identity-based access.

Answered from the vendors’ own pages

FireMonkey: What makes FireMonkey different from Violentmonkey?

It manages user styles as well as user scripts. The usual arrangement is a script manager plus a separate style manager such as Stylus; FireMonkey replaces both with one extension.

Source
HashiCorp Vault: Does HashiCorp Vault have a free version?

Yes. The open-source Community Edition is completely free and includes core secrets management, dynamic secrets, and encryption as a service. It is self-hosted with no licensing fees or secret count limits, but lacks enterprise features like namespaces, disaster recovery replication, and Sentinel policies.

Source
FireMonkey: Which browsers does FireMonkey support?

Firefox only. Desktop requires Firefox 93 or later and Android requires 113, with an API minimum of 102.

Source
HashiCorp Vault: Can I use HashiCorp Vault in production?

The Community Edition is suitable for non-production environments and small teams. For production deployments, organizations typically use HCP Vault Dedicated (managed cloud service starting at approximately 22 USD per month) or Vault Enterprise with custom pricing that includes disaster recovery, performance replication, and 24/7 support.

Source
FireMonkey: Is FireMonkey open source?

Yes, under the MPL-2.0 licence.

Source
HashiCorp Vault: What are the main integrations available?

Vault integrates with AWS, Azure, Google Cloud, Active Directory, Okta, and 80+ other platforms. It supports dynamic credential generation for cloud providers, database systems, and identity services, enabling centralized secret management across multi-cloud infrastructure.

Source
FireMonkey: Will my existing Tampermonkey scripts work?

Not necessarily. The project states that while it shares functionality with Greasemonkey, Tampermonkey and Stylus, there are differences, so scripts and styles written for those may need adjusting.

Source
HashiCorp Vault: Does Vault work offline?

Vault requires network connectivity to function as it is a centralized secrets management server. However, it can be deployed on-premises for air-gapped environments, and clients can cache short-lived tokens for temporary offline access once authenticated.

Source
FireMonkey: What editor does FireMonkey use?

Current versions use the Monaco editor with ESLint, the same editor component that powers VS Code.

Source
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