| _pk_id. | www.cancer.ie | Matomo | 393 days | Used by Matomo to store a few details about the user such as the unique visitor ID |
| _pk_ses. | www.cancer.ie | Matomo | 1 hour | Used by Matomo to store a few details about the user such as the unique visitor ID |
| _gtmeec | .cancer.ie | Google LLC | 90 days | This cookie is set by Google Tag Manager as part of Event Enhancement. It is an HTTP-only, secure cookie used to enrich event data, improving event match quality and enabling more accurate conversion attribution to marketing campaigns. |
| _fbp | .cancer.ie | Meta Platforms | 90 days | Facebook Pixel advertising first-party cookie. Used by Facebook to track visits across websites to deliver a series of advertisement products such as real time bidding from third party advertisers. |
| _ga | .cancer.ie | Google LLC | 400 days | Contains a unique identifier used by Google Analytics to determine that two distinct hits belong to the same user across browsing sessions. |
| _ga_ | .cancer.ie | Google LLC | 400 days | Contains a unique identifier used by Google Analytics 4 to determine that two distinct hits belong to the same user across browsing sessions. |
| fundraiseup_stat | .cancer.ie | Fundraise Up Inc. | Session | Used by Fundraise Up to enable secure donation processing, remember supporter preferences, and gather anonymous statistics to improve fundraising performance. |
| fundraiseup_func | .cancer.ie | Fundraise Up Inc. | Session | Used by Fundraise Up to enable secure donation processing, remember supporter preferences, and gather anonymous statistics to improve fundraising performance. |
| _clck | .cancer.ie | Microsoft Corporation | 365 days | Persists the Clarity User ID and preferences, unique to that site, on the browser. This ensures that behavior in subsequent visits to the same site will be attributed to the same user ID. |
| _clsk | .cancer.ie | Microsoft Corporation | 1 day | Connects multiple page views by a user into a single Clarity session recording. |
| _cltk | | Microsoft Corporation | Session | This cookie is installed by Microsoft Clarity tool and stores information about how visitors use the website |
| Visitor | fundraise.cancer.ie | Funraisin | 60 days | Serves as a basic mechanism on Funraisin websites to recognize and track individual visitors or sessions as they browse on the website |
| _ttp | .cancer.ie+1 | TikTok Inc. | 90 days | Used by Tiktok to measure and improve the performance of advertising campaigns and to personalize the user's experience (including ads) on TikTok. |
| _tt_enable_cookie | .cancer.ie | TikTok Inc. | 90 days | TikTok Pixel uses this cookie to check whether cookies can be enabled for tracking and attribution. |
| ttcsid | .cancer.ie | TikTok Inc. | 90 days | Used to recognize and match events for TikTok advertising campaigns; helps with conversion attribution and ad optimization. |
| ttcsid_ | .cancer.ie | TikTok Inc. | 90 days | Used to recognize and match events for TikTok advertising campaigns; helps with conversion attribution and ad optimization. |
| tt_sessionId | | TikTok Inc. | Session | Holds a unique ID for the current browsing session. Used to group multiple events (page views, clicks) into one session for attribution. |
| tt_pixel_session_index | | TikTok Inc. | Session | Keeps track of the number of sessions initiated by the same visitor, linked to the TikTok Pixel ID. Supports event de-duplication and session attribution. |
| tt_appInfo | | TikTok Inc. | Session | Stores app/page context information that helps TikTok attribute events correctly (e.g., which pixel, which page instance). |
| YSC | .youtube.com | Google LLC | Session | This cookie is set by YouTube video service on pages with YouTube embedded videos to track views. |
| VISITOR_INFO1_LIVE | .youtube.com | Google LLC | 180 days | Set by YouTube and used for various purposes, including analytical and advertising. |
| VISITOR_PRIVACY_METADATA | .youtube.com | Google LLC | 180 days | Used by YouTube to store the user’s privacy and consent settings for embedded videos. It helps ensure that user privacy choices (like consent for personalized ads or tracking) are respected when watching embedded YouTube content. |
| __Secure-ROLLOUT_TOKEN | .youtube.com | Google LLC | 180 days | Used by YouTube to manage feature rollout and experimentation. It helps Google control which new features or interface changes are shown to users as part of testing and staged rollouts, ensuring consistent experience for a given user during an experiment. |
| ai_user | irish-cancer-society.hirehive.com | Microsoft Corporation | 365 days | Used by Azure Application Insights to collect statistical usage and telemetry data. Stores a unique ID to recognize users on returning visits, helping analyze behavior, monitor performance, and identify issues. |
| _omappvp | www.cancer.ie+1 | OptinMonster | 400 days | This cookie is set by OptinMonster and is used for determining new vs. returning visitors. |
| _omappvs | www.cancer.ie+1 | OptinMonster | 1 hour | This cookie is set by OptinMonster and is used to determine when a new visitor becomes a returning visitor. |
| omVisitsFirst | | OptinMonster | Persistent | This cookie is set by OptinMonster and is used to hold page, referrer and timestamp data for when a specific visitor first visited a site. |
| omSessionPageviews | | OptinMonster | Session | omSessionPageviews |
| omSessionStart | | OptinMonster | Session | Stores the time when a user starts a session. |
| omScrollHeight | | OptinMonster | Session | |
| omVisits | | OptinMonster | Persistent | This cookie is set by OptinMonster and is used to hold the journey data for a specific visitor on a site. |
| ViewSource2-46644 | .irish-cancer-society.hirehive.com | HireHive | 2 days | |
| job_source | | Hirehive | Persistent | |
| __Secure-YNID | .youtube.com | Google LLC | 180 days | This cookie is used to track user analytics for users of an embedded video. It also tracks ads. |
| omSeen- | .cancer.ie | OptinMonster | 400 days | This cookie ensures that if you close a pop-up, it won't immediately reopen on your next website visit. |
| _omra | .cancer.ie | OptinMonster | 365 days | used to store campaign interaction and conversion data for revenue attribution |
| omLastSeen | | OptinMonster | Persistent | Records the date the user last interacted with a pop-up campaign. |
| omFoldersSeen | | OptinMonster | Persistent | Categorises users based on the activity record of pop-ups seen before. |