Firefox port of Word Replacer III (v3.0.2)

Fixed manifest id mismatch — now matches this add-on's registered AMO ID
Background script uses scripts instead of service_worker, since Firefox's MV3 implementation doesn't run service workers
Added strict_min_version: 115.0 (Firefox's signing root cert requires 115+ to validate signed extensions)
Added required data_collection_permissions disclosure:
required: none — core find/replace and storage need no data collection
optional: technicalAndInteraction — covers the Share Link feature, which sends encoded replacement rules through TinyURL's API when a user opts in

No code changes were needed beyond the manifest — all APIs used (chrome.storage, chrome.tabs, chrome.runtime, etc.) are standard WebExtensions APIs supported natively by Firefox.