Opportunity Cost by TFTC, Moses

5 Stars out of 5

Opportunity Cost version history - 6 versions

Be careful with old versions! These versions are displayed for testing and reference purposes.You should always use the latest version of an add-on.
Latest version
Version 0.0.9
Released 6 Aug 2026 - 4.44 MB
Works with firefox 58.0 and later
Security and privacy update for Opportunity Cost 0.0.9.
- Validates complete Bitcoin price responses and rejects anomalous data.
- Replaces fixed polling and price history with demand-driven, bounded caching.
- Reduces extension permissions and adds a Clear All Data control.
- Updates the price API and website to opportunitycost.xyz.
- Adds an explicit no-data-collection disclosure and correctly sized extension icons.
Source code released under All Rights Reserved
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Version 0.0.7
Released 18 Jul 2025 - 4.42 MB
Works with firefox 58.0 and later
fix: correct parsing of decimal values with magnitude suffixes (e.g., $0.12M)
Source code released under All Rights Reserved
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Version 0.0.5
Released 17 Jun 2025 - 4.33 MB
Works with firefox 58.0 and later
Removed rounding logic for BTC values to provide more precise bitcoin conversions
Source code released under All Rights Reserved
Download file
Version 0.0.4
Released 12 Jun 2025 - 4.33 MB
Works with firefox 58.0 and later
- Abbreviated sats display for large satoshi values ≥100,000 sats (e.g. 250k sats)
- Support for processing price elements that split currency symbols and numeric values- Currency selector in extension popup on hovering bitcoin price
- Added additional currencies
Source code released under All Rights Reserved
Download file

Opportunity Cost by TFTC, Moses

Latest version

Version 0.0.9

Older versions

Version 0.0.8

Version 0.0.7

Version 0.0.6

Version 0.0.5

Version 0.0.4